Remove optimization remarks.

Author: rlavaee

llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -2168,14 +2168,6 @@ void AsmPrinter::emitFunctionBody() {
     // If the block ends with a call, we may need to emit a prefetch target
     // at the end.
     EmitPrefetchTargetSymbolIfNeeded();
-    if (PrefetchTargetIt != PrefetchTargets.end()) {
-      MachineOptimizationRemarkMissed R(
-          "insert-code-prefetch", "MissingPrefetchTarget",
-          MF->getFunction().getSubprogram(), &MBB);
-      R << "failed to map "
-        << ore::NV("NumMissedTargets", PrefetchTargets.end() - PrefetchTargetIt)
-        << " prefetch targets";
-    }
 
     // We must emit temporary symbol for the end of this basic block, if either
     // we have BBLabels enabled or if this basic blocks marks the end of a