Recommitting r358783 and r358786 "[MS] Emit S_HEAPALLOCSITE debug info" with fixes for buildbot error (undefined assembler label).

Summary:
This emits labels around heapallocsite calls and S_HEAPALLOCSITE debug
info in codeview. Currently only changes FastISel, so emitting labels still
needs to be implemented in SelectionDAG.

Reviewers: rnk

Subscribers: aprantl, hiraditya, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D61083

llvm-svn: 359149
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index 1590cd7..43f090a 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -3985,6 +3985,7 @@
   }
 
   Result->addMemOperand(*FuncInfo.MF, createMachineMemOperandFor(LI));
+  Result->cloneInstrSymbols(*FuncInfo.MF, *MI);
   MachineBasicBlock::iterator I(MI);
   removeDeadCode(I, std::next(I));
   return true;