minor change

Author: mihajlovicana

llvm/lib/Target/AMDGPU/AMDGPUInsertDelayAlu.cpp

@@ -400,8 +400,9 @@ class AMDGPUInsertDelayAlu : public MachineFunctionPass {
 
         if (SII->isVALU(MI.getOpcode())) {
           for (const auto &Op : MI.defs()) {
-            for (MCRegUnit Unit : TRI->regunits(Op.getReg())) {
-              if (AMDGPU::isSGPR(Op.getReg(), TRI)) {
+            Register Reg = Op.getReg();
+            for (MCRegUnit Unit : TRI->regunits(Reg)) {
+              if (AMDGPU::isSGPR(Reg, TRI)) {
                 lastSGPRfromVALU = Unit;
                 break;
               }