[llvm] [AMDGPU] Fix getDestEquivalentVGPRClass narrowing AV-class registers (PR #212963)

[Matt Arsenault via llvm-commits]

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@@ -9808,7 +9808,7 @@ const TargetRegisterClass *SIInstrInfo::getDestEquivalentVGPRClass(
       if (!NewDstRC)
         return nullptr;
     } else {
-      if (RI.isVGPRClass(NewDstRC) || NewDstRC == &AMDGPU::VReg_1RegClass)
+      if (RI.hasVGPRs(NewDstRC) || NewDstRC == &AMDGPU::VReg_1RegClass)
         return nullptr;
 
       NewDstRC = RI.getEquivalentVGPRClass(NewDstRC);
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arsenm wrote:

This is losing the AV-ness, that should be preserved 

https://github.com/llvm/llvm-project/pull/212963