[llvm-branch-commits] [llvm] [AMDGPU] Make VGPR_16_Lo128 allocatable (PR #173309)

[Joe Nash via llvm-branch-commits]

Sisyph wrote:

> What was the reason this RC was not allocatable before?

The rationale is here https://github.com/llvm/llvm-project/pull/173307#pullrequestreview-3618677777


https://github.com/llvm/llvm-project/pull/173309