[PATCH] D121402: [X86][NFC] Move table from getRelaxedOpcodeArith into its own class

[Amir Ayupov via Phabricator via llvm-commits]

Amir created this revision.
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Move out the table and prepare the code to reuse it for the reverse mapping.
Follows the example of memory folding/unfolding tables in X86InstrFoldTables.cpp

Preparation step to unify `llvm::X86::getRelaxedOpcodeArith` and 
`getShortArithOpcode` in BOLT X86MCPlusBuilder.cpp.

Addresses https://lists.llvm.org/pipermail/llvm-dev/2022-January/154526.html


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121402

Files:
  llvm/lib/Target/X86/MCTargetDesc/CMakeLists.txt
  llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
  llvm/lib/Target/X86/MCTargetDesc/X86InstrRelaxTables.cpp
  llvm/lib/Target/X86/MCTargetDesc/X86InstrRelaxTables.h

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