Reapply r112091 and r111922, support for metadata linking, with a

fix: add a flag to MapValue and friends which indicates whether
any module-level mappings are being made. In the common case of
inlining, no module-level mappings are needed, so MapValue doesn't
need to examine non-function-local metadata, which can be very
expensive in the case of a large module with really deep metadata
(e.g. a large C++ program compiled with -g).

This flag is a little awkward; perhaps eventually it can be moved
into the ClonedCodeInfo class.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112190 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/InlineFunction.cpp

@@ -365,7 +365,8 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI) {
     // have no dead or constant instructions leftover after inlining occurs
     // (which can happen, e.g., because an argument was constant), but we'll be
     // happy with whatever the cloner can do.
-    CloneAndPruneFunctionInto(Caller, CalledFunc, VMap, Returns, ".i",
+    CloneAndPruneFunctionInto(Caller, CalledFunc, VMap, 
+                              /*ModuleLevelChanges=*/false, Returns, ".i",
                               &InlinedFunctionInfo, IFI.TD, TheCall);
 
     // Remember the first block that is newly cloned over.