[llvm] [AMDGPU] add tests for loop definition of bitconvert (PR #133052)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Also what are these lit tests for ? why do we need to test all widths?

Every operation with every type should be tested.

For this case, we already should have test coverage so I'm not sure I understand what is new here. We should perhaps split / replace the existing test with a more consistent pattern, but this patch is purely additive?



https://github.com/llvm/llvm-project/pull/133052