[PATCH] D142968: [NFC] Extract `CodeGenInstAlias` into its own *.h/*.cpp

[Jay Foad via Phabricator via cfe-commits]

foad added a comment.

Looks OK but what's the motivation for it?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D142968/new/

https://reviews.llvm.org/D142968