Duncan P. N. Exon Smith e3ae958f94 AsmPrinter: Emit the DwarfStringPool offset directly when possible ...

Change `DwarfStringPool` to calculate byte offsets on-the-fly, and
update `DwarfUnit::getLocalString()` to use a `DIEInteger` instead of a
`DIEDelta` when Dwarf doesn't use relocations (i.e., Mach-O).  This
eliminates another call to `EmitLabelDifference()`, and drops memory
usage from 865 MB down to 861 MB, around 0.5%.

(I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`;
see r236629 for details.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238114 91177308-0d34-0410-b5e6-96231b3b80d8

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AArch64

[DebugInfo] Debug locations for constant SD nodes

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ARM

[DebugInfo] Debug locations for constant SD nodes

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COFF

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Inputs

Temporary delete the test while we're investigating crashes in LLVMObject it causes.

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Mips

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PDB

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PowerPC

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Sparc

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SystemZ

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X86

AsmPrinter: Emit the DwarfStringPool offset directly when possible

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2009-10-16-Phi.ll

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2009-11-03-InsertExtractValue.ll

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2009-11-05-DeadGlobalVariable.ll

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2009-11-06-NamelessGlobalVariable.ll

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2009-11-10-CurrentFn.ll

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2010-01-05-DbgScope.ll

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2010-03-12-llc-crash.ll

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2010-03-19-DbgDeclare.ll

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2010-03-24-MemberFn.ll

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2010-04-06-NestedFnDbgInfo.ll

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2010-04-19-FramePtr.ll

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2010-05-03-DisableFramePtr.ll

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2010-05-03-OriginDIE.ll

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2010-05-10-MultipleCU.ll

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2010-06-29-InlinedFnLocalVar.ll

AsmPrinter: Emit the DwarfStringPool offset directly when possible

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2010-07-19-Crash.ll

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2010-10-01-crash.ll

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accel-table-hash-collisions.ll

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arm-relocs.test

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array.ll

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block-asan.ll

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bug_null_debuginfo.ll

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constant-pointers.ll

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constant-sdnodes-have-dbg-location.ll

[DebugInfo] Debug locations for constant SD nodes

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constantfp-sdnodes-have-dbg-location.ll

[DebugInfo] Debug locations for constant SD nodes

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cross-cu-inlining.ll

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cross-cu-linkonce-distinct.ll

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cross-cu-linkonce.ll

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cu-range-hole.ll

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cu-ranges.ll

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dead-argument-order.ll

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debug-info-always-inline.ll

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debug-info-qualifiers.ll

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debuginfofinder-forward-declaration.ll

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debuginfofinder-multiple-cu.ll

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debuglineinfo.test

Make it easier to use DwarfContext with MCJIT

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dwarf-public-names.ll

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dwarfdump-accel.test

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dwarfdump-debug-frame-simple.test

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dwarfdump-debug-loc-simple.test

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dwarfdump-dump-flags.test

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dwarfdump-line-dwo.test

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dwarfdump-objc.test

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dwarfdump-pubnames.test

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dwarfdump-ranges.test

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dwarfdump-type-units.test

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dwarfdump-zlib.test

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empty.ll

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enum-types.ll

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enum.ll

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global.ll

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gmlt.test

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incorrect-variable-debugloc1.ll

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incorrect-variable-debugloc.ll

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inheritance.ll

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inline-debug-info-multiret.ll

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inline-debug-info.ll

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inline-no-debug-info.ll

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inline-scopes.ll

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inlined-arguments.ll

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inlined-vars.ll

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llvm-symbolizer-zlib.test

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llvm-symbolizer.test

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location-verifier.ll

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lto-comp-dir.ll

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member-order.ll

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member-pointers.ll

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member-pointers.o

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missing-abstract-variable.ll

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missing-abstract-variable.o

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multiline.ll

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namespace_function_definition.ll

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namespace_inline_function_definition.ll

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namespace.ll

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nodebug.ll

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piece-verifier.ll

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PR20038.ll

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restrict.ll

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sugared-constants.ll

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template-recursive-void.ll

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tu-composite.ll

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tu-member-pointer.ll

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two-cus-from-same-file.ll

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typedef.ll

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unconditional-branch.ll

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varargs.ll

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version.ll

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