[PATCH] D149833: [X86] Omit predicate In64BitMode for instructions w/ GP64 operand in X86InstrArithmetic.td, NFCI

[Kan Shengchen via Phabricator via llvm-commits]

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As we discussed in D138639 <https://reviews.llvm.org/D138639>, we usually omit `In64BitMode` on instructions that
have a GR64 operand b/c

1. Assembler would never parse a GR64 register name outside of 64-bit mode
2. GR64 is not legal during ISEL outside of 64-bit mode
3. Adding them might increase the size of the table in X86GenDAGISel.inc

I will do similar clean in other files if this patch is accepted.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149833

Files:
  llvm/lib/Target/X86/X86InstrArithmetic.td

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