[llvm] [AMDGPU] Precommit Tests for 'Fold redundant inf/nan checks into frexp instructions' (PR #214964)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

Test some cases where this is applied to both results from the intrinsic (which is the most realistic case)

https://github.com/llvm/llvm-project/pull/214964