[clang] [llvm] Reimplement constrained 'trunc' using operand bundles (PR #118253)

[Kevin P. Neal via llvm-commits]

kpneal wrote:

D146845 wasn't committed because it would have caused test failures. The tests are wrong, the new checks reveal this, but the new checks cannot be committed until all broken tests are fixed. Otherwise we get failures from the bots and the Verifier checks would have been reverted.

The D146845 ticket encodes the current rules for the strictfp attribute. If you are making changes that fail with D146845 applied to your tree then you are moving in the wrong direction.

https://github.com/llvm/llvm-project/pull/118253