[llvm] [AMDGPU][True16][CodeGen] update GFX11Plus codegen test with true16 flag (PR #135078)

[Joe Nash via llvm-commits]

https://github.com/Sisyph approved this pull request.

LGTM, the run line format looks good.

If file size is an issue, it would be possible to omit true16 run lines for some of the more verbose tests, such as amdgcn.bitcast.1024bit.ll. But the two issues with that are  1) we won't have regression or improvement coverage there and 2) when we want to flip the default from fake16 to true16 we will see the big diffs. It would be nice to have a clean default flip that doesn't affect any tests. Please wait a day or two to see if there is any more comment on that.

https://github.com/llvm/llvm-project/pull/135078