[llvm] AMDGPU: Rewrite VGPR MFMAs to AGPR when directly copied to AGPR class (PR #152480)

[Sirish Pande via llvm-commits]

================
@@ -109,12 +109,17 @@ bool AMDGPURewriteAGPRCopyMFMAImpl::run(MachineFunction &MF) const {
 
     // Find AV_* registers assigned to AGPRs.
     const TargetRegisterClass *VirtRegRC = MRI.getRegClass(VReg);
-    if (!TRI.isVectorSuperClass(VirtRegRC))
+    if (!TRI.hasAGPRs(VirtRegRC))
----------------
srpande wrote:

I know we don't have hasAVGPRs. But shouldn't this be something like hasAVGPR, and when looking at AssignedRC, check whether AssignedRC is a AGPRClass, which is essentially a subclass of AVGPR?

https://github.com/llvm/llvm-project/pull/152480