[llvm] [ASan] Prevent assert from scalable vectors in FunctionStackPoisoner. (PR #155357)

[David Green via llvm-commits]

davemgreen wrote:

> Nit: the title is ambiguous. "Protect against scalable vectors" could be misinterpreted to mean that scalar vectors will have use-after-scope protection; this patch is actually deliberately not attempting instrumentation for scalable vectors.

Good point! I hadn't thought of the two different meanings. I've updated the title.

https://github.com/llvm/llvm-project/pull/155357