[clang] [clang] ``noconvergent`` does not affect calls to convergent functions (PR #132701)

[Matt Arsenault via cfe-commits]

arsenm wrote:

> Only convergent is an attribute in LLVM IR, and there is no equivalent of clang::noconvergent.

There should be (and I still have a patch somewhere to add it)

https://github.com/llvm/llvm-project/pull/132701