Subzero: Improve the use of timers.

src/IceTargetLoweringX86BaseImpl.h

Index: src/IceTargetLoweringX86BaseImpl.h
diff --git a/src/IceTargetLoweringX86BaseImpl.h b/src/IceTargetLoweringX86BaseImpl.h
index 7707d148af2d09635a148c9d2cc6656fe68f4ea1..0b5423efa6a43f2fa476cef5cc75360875c784a7 100644
--- a/src/IceTargetLoweringX86BaseImpl.h
+++ b/src/IceTargetLoweringX86BaseImpl.h
@@ -615,6 +615,7 @@ bool isSameMemAddressOperand(const Operand *A, const Operand *B) {
 }
 
 template <typename TraitsType> void TargetX86Base<TraitsType>::findRMW() {
+  TimerMarker _(TimerStack::TT_findRMW, Func);
   Func->dump("Before RMW");
   if (Func->isVerbose(IceV_RMW))
     Func->getContext()->lockStr();
@@ -732,6 +733,7 @@ inline bool canFoldLoadIntoBinaryInst(Operand *LoadSrc, Variable *LoadDest,
 }
 
 template <typename TraitsType> void TargetX86Base<TraitsType>::doLoadOpt() {
+  TimerMarker _(TimerStack::TT_loadOpt, Func);
   for (CfgNode *Node : Func->getNodes()) {
     Context.init(Node);
     while (!Context.atEnd()) {