[clang] [CIR] Add constrained FP binary operations (PR #203648)

[via cfe-commits]

adams381 wrote:

Closing this in favor of your strict-FP direction.  The attribute-based approach was the alternative this PR's description already flagged, so consolidating there rather than landing separate constrained ops makes more sense, especially with it aligning to the strict-FP RFC.  I'll review and test once it's up.


https://github.com/llvm/llvm-project/pull/203648