[PATCH] D94002: [LangRef] Make lifetime intrinsic's semantics consistent with StackColoring's comment

[Ralf via Phabricator via llvm-commits]

RalfJung added a comment.

> The exact semantics of lifetime.start depends on the pattern matching patterns in the stack coloring algorithm. So this intrinsic cannot be abused. It must be used for the uses it was created for only.

That's fair, but then shouldn't the docs say that? Usually one would expect the docs to say everything there is to be said; so in this case a dedicated warning might be in order to document the caveats you just mentioned.


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  https://reviews.llvm.org/D94002/new/

https://reviews.llvm.org/D94002