[llvm] [AMDGPU][NFC] Enable gfx942 for more tests (PR #154363)

[Janek van Oirschot via llvm-commits]

JanekvO wrote:

> The int_to_fp*s removed FIXMEs so those are probably more interesting.

Sorry, which FIXMEs? Also, I only have enabled for the int_to_fp* tests that were affected by the bitcast combine so let me know if I should do so for the other int_to_fp* tests as well.

https://github.com/llvm/llvm-project/pull/154363