Re-implement DebugIR in a way that does not subclass AssemblyWriter:

- move AsmWriter.h from public headers into lib
- marked all AssemblyWriter functions as non-virtual; no need to override them
- DebugIR now "plugs into" AssemblyWriter with an AssemblyAnnotationWriter helper
- exposed flags to control hiding of a) debug metadata b) debug intrinsic calls

C/R: Paul Redmond



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182617 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Instrumentation.h

@@ -80,7 +80,9 @@ FunctionPass *createBoundsCheckingPass();
 
 /// createDebugIRPass - Create and return a pass that modifies a module's
 /// debug metadata to point back to IR instead of the original source file
-ModulePass *createDebugIRPass(StringRef FilenamePostfix);
+ModulePass *createDebugIRPass(StringRef FilenamePostfix,
+                              bool hideDebugIntrinsics = true,
+                              bool hideDebugMetadata = true);
 
 } // End llvm namespace