Silence unused variable warning; NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268392 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/AMDGPU/GCNHazardRecognizer.cpp

@@ -157,15 +157,14 @@ int GCNHazardRecognizer::checkSMEMSoftClauseHazards(MachineInstr *SMEM) {
   // (including itself). If we encounter this situaion, we need to break the
   // clause by inserting a non SMEM instruction.
 
-  const SIInstrInfo *TII = static_cast<const SIInstrInfo*>(ST.getInstrInfo());
   std::set<unsigned> ClauseDefs;
   std::set<unsigned> ClauseUses;
 
   for (MachineInstr *MI : EmittedInstrs) {
 
     // When we hit a non-SMEM instruction then we have passed the start of the
     // clause and we can stop.
-    if (!MI || !TII->isSMRD(*MI))
+    if (!MI || !SIInstrInfo::isSMRD(*MI))
       break;
 
     addRegsToSet(MI->defs(), ClauseDefs);