efriedma added a comment.

I don't like using metadata like this.  Dropping metadata should generally 
preserve the semantics of the code.

> without resorting to inline assembly (which often results in poor codegen).

Could you give an example of the resulting assembly with mustcontrol vs. this 
patch?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D103958/new/

https://reviews.llvm.org/D103958

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