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

[Matt Arsenault via llvm-commits]

arsenm 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.

The ones in the test diffs from 7900334dd530416b70fb04c8abb6f8c2c65da86d

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