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

[Matt Arsenault via llvm-commits]

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arsenm wrote:

Currently not convinced we aren't losing test coverage. The content of some of the new bitwidth suffixed files don't have enough functions to justify splitting up. I'd prefer generated, wholly consistent tests with the suffixes if we're splitting this up 

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