[llvm] [AMDGPU] Allow lit() on operands which do not accept modifiers (PR #69527)

[Jay Foad via llvm-commits]

https://github.com/jayfoad commented:

This looks OK but I'm not too familiar with operand parsing. Is there a cleaner way to implement this, so that we don't have two different places where "lit" is parsed?

https://github.com/llvm/llvm-project/pull/69527