[AMDGPU] Use std::is_same_v. NFC.

Author: jayfoad

llvm/lib/Target/AMDGPU/GCNIterativeScheduler.cpp

@@ -383,7 +383,7 @@ void GCNIterativeScheduler::scheduleRegion(Region &R, Range &&Schedule,
 
   // Schedule consisting of MachineInstr* is considered 'detached'
   // and already interleaved with debug values
-  if (!std::is_same<decltype(*Schedule.begin()), MachineInstr*>::value) {
+  if (!std::is_same_v<decltype(*Schedule.begin()), MachineInstr*>) {
     placeDebugValues();
     // Unfortunately placeDebugValues incorrectly modifies RegionEnd, restore
     // assert(R.End == RegionEnd);