[MCA] Remove SM.hasNext() call in FetchStage::execute.

Summary:
This is redundant, as FetchStage::getNextInstruction already checks this
and returns llvm::ErrorSuccess() as appropriate.

NFC.

Reviewers: andreadb

Subscribers: gbedwell, llvm-commits

Differential Revision: https://reviews.llvm.org/D52642

llvm-svn: 343555

llvm/tools/llvm-mca/lib/Stages/FetchStage.cpp

@@ -60,7 +60,7 @@ llvm::Error FetchStage::execute(InstRef & /*unused */) {
 }
 
 llvm::Error FetchStage::cycleStart() {
-  if (!CurrentInstruction && SM.hasNext())
+  if (!CurrentInstruction)
     return getNextInstruction();
   return llvm::ErrorSuccess();
 }