[llvm] [AMDGPU][True16][MC] added missing testlines for t16 test (PR #135823)

[Joe Nash via llvm-commits]

https://github.com/Sisyph commented:

Adding missing true16 tests is good, but there seem to be lots of types of other changes in this PR. Most of the other line changes seem unnecessary.

https://github.com/llvm/llvm-project/pull/135823