[llvm] [AMDGPU] Reland "Remove redundant s_cmp_lg_* sX, 0" (PR #164201)

[Matt Arsenault via llvm-commits]

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@@ -729,6 +729,7 @@ class SIInstrInfo final : public AMDGPUGenInstrInfo {
     case AMDGPU::S_MAX_I32:
     case AMDGPU::S_MAX_U32:
     case AMDGPU::S_ADDK_I32:
+    case AMDGPU::SI_PC_ADD_REL_OFFSET:
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arsenm wrote:

Also it would be better to invert the logic, The default should not be to assume this is foldable 

https://github.com/llvm/llvm-project/pull/164201