[AMDGPU][MachineVerifier] test failures in SIFoldOperands

After PR:llvm#151421 merged
following fails in SIFoldOperands showed up.

LLVM :: CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.mfma.gfx90a.ll
LLVM :: CodeGen/AMDGPU/llvm.amdgcn.mfma.gfx90a.ll
LLVM :: CodeGen/AMDGPU/llvm.amdgcn.mfma.ll
LLVM :: CodeGen/AMDGPU/mfma-loop.ll
LLVM :: CodeGen/AMDGPU/rewrite-vgpr-mfma-to-agpr.ll

In Folding code, if folded operand is register ensure earlyClobber
is set.

Author: AbhayKanhere

llvm/lib/Target/AMDGPU/SIFoldOperands.cpp

@@ -689,6 +689,10 @@ bool SIFoldOperandsImpl::updateOperand(FoldCandidate &Fold) const {
     if (!TII->isOperandLegal(*MI, OpNo, &New))
       return false;
 
+    const MCInstrDesc &MCID = MI->getDesc();
+    if (MCID.getOperandConstraint(OpNo, MCOI::EARLY_CLOBBER) != -1) {
+      MI->getOperand(OpNo).setIsEarlyClobber(true);
+    }
     Old.ChangeToImmediate(*ImmVal);
     return true;
   }