nikic added a comment.

FYI this showed up as a 1% compile-time regression in terms of instructions 
retired for `O0-g` builds: 
https://llvm-compile-time-tracker.com/compare.php?from=32a4ad3b6ce6028a371b028cf06fa5feff9534bf&to=54c1bcab90102481fe43b73f8547d47446ba2163&stat=instructions

Looking at the diff, it's not really obvious to me what could cause that, 
possibly GCC is just really bad at optimizing Optional<MemoryBufferRef>.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D89394/new/

https://reviews.llvm.org/D89394

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