Changes

Summary

Commit b85b4e5a6f8579c137fecb59a4d75d7bfb111f79 by akhuang Add an instruction marker field to the ExtraInfo in MachineInstrs. Summary: Add instruction marker to MachineInstr ExtraInfo. This does almost the same thing as Pre/PostInstrSymbols, except that it doesn't create a label until printing instructions. This allows for labels to be put around instructions that are deleted/duplicated somewhere. Also undo the workaround in r375137. Reviewers: rnk Subscribers: MatzeB, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D69136
	llvm/test/CodeGen/X86/label-heapallocsite.ll
	llvm/include/llvm/CodeGen/MachineInstr.h
	llvm/lib/CodeGen/MachineInstr.cpp
	llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
	llvm/test/CodeGen/X86/taildup-heapallocsite.ll
	llvm/include/llvm/CodeGen/MachineFunction.h
	llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
	llvm/lib/CodeGen/MachineFunction.cpp
	llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
	llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
	llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h
	llvm/unittests/CodeGen/MachineInstrTest.cpp