[llvm] [StandardInstrumentation] Annotate loops with the function name (PR #90756)

[Jamie Schmeiser via llvm-commits]

jamieschmeiser wrote:

I had lost track of https://github.com/llvm/llvm-project/pull/87626 but the memory of it was haunting me during this review.  It hasn't landed yet but it may be something you want to look at.

https://github.com/llvm/llvm-project/pull/90756