[PATCH] D121600: [Codegen] Allow meta instruction to be target dependent

[Kan Shengchen via Phabricator via llvm-commits]

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A bit `isMeta` is added for class `Instruction` in tablegen,
which is used to indicate whether it's a meta instruction.

This fixes the bug that `Int_MemBarrier` for target X86 and Xcore
should be marked as a meta instruction but not.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121600

Files:
  llvm/include/llvm/CodeGen/MachineInstr.h
  llvm/include/llvm/MC/MCInstrDesc.h
  llvm/include/llvm/Target/Target.td
  llvm/lib/Target/X86/X86InstrCompiler.td
  llvm/lib/Target/XCore/XCoreInstrInfo.td
  llvm/unittests/CodeGen/LexicalScopesTest.cpp
  llvm/unittests/MIR/MachineMetadata.cpp
  llvm/utils/TableGen/CodeGenInstruction.cpp
  llvm/utils/TableGen/CodeGenInstruction.h
  llvm/utils/TableGen/InstrInfoEmitter.cpp

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