Subzero: Improve malloc/free behavior.

src/IceInst.cpp

Index: src/IceInst.cpp
diff --git a/src/IceInst.cpp b/src/IceInst.cpp
index 89c57e8a95571924000cc6783747da2bfc6263d1..e1b5f436d9381816e9179899e775ea6a048a61fa 100644
--- a/src/IceInst.cpp
+++ b/src/IceInst.cpp
@@ -250,6 +250,7 @@ InstBr::InstBr(Cfg *Func, CfgNode *Target)
 
 NodeList InstBr::getTerminatorEdges() const {
   NodeList OutEdges;
+  OutEdges.reserve(TargetTrue ? 2 : 1);
   OutEdges.push_back(TargetFalse);
   if (TargetTrue)
     OutEdges.push_back(TargetTrue);
@@ -409,6 +410,7 @@ void InstSwitch::addBranch(SizeT CaseIndex, uint64_t Value, CfgNode *Label) {
 
 NodeList InstSwitch::getTerminatorEdges() const {
   NodeList OutEdges;
+  OutEdges.reserve(NumCases + 1);
   OutEdges.push_back(LabelDefault);
   for (SizeT I = 0; I < NumCases; ++I) {
     OutEdges.push_back(Labels[I]);