efriedma added a comment.

> The first argument in the call is an undef but the argument type is also 
> marked as noundef, so this is unreachable

It looks like your code was getting miscompiled?  If I'm understanding 
correctly, without this patch, we assume the lambda body is unreachable, and 
simply delete all the corresponding code.  (That does save space, but not in a 
useful way.)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D132275/new/

https://reviews.llvm.org/D132275

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