[llvm] [Draft][AMDGPU] Rematerialize VGPR candidates when SGPR spills results in VGPR Excess (PR #168079)

[Juan Manuel Martinez Caamaño via llvm-commits]

jmmartinez wrote:

I'll try to rebase this patch over https://github.com/llvm/llvm-project/pull/153092 .

https://github.com/llvm/llvm-project/pull/168079