Allow control intructions to have side effects.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index c73d073406c8bda37658f5cf10e6230960a00d9b..c23118b1caca3015504b4b18cd8f7fff1c03252b 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -681,7 +681,7 @@ LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
   instr->MarkAsCall();
   instr = AssignPointerMap(instr);
 
-  if (hinstr->HasObservableSideEffects()) {
+  if (hinstr->HasObservableSideEffects() && !hinstr->IsControlInstruction()) {
     ASSERT(hinstr->next()->IsSimulate());
     HSimulate* sim = HSimulate::cast(hinstr->next());
     ASSERT(instruction_pending_deoptimization_environment_ == NULL);
@@ -1700,14 +1700,15 @@ LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
+LInstruction* LChunkBuilder::DoCompareGenericAndBranch(
+    HCompareGenericAndBranch* instr) {
   ASSERT(instr->left()->representation().IsSmiOrTagged());
   ASSERT(instr->right()->representation().IsSmiOrTagged());
   LOperand* context = UseFixed(instr->context(), esi);
   LOperand* left = UseFixed(instr->left(), edx);
   LOperand* right = UseFixed(instr->right(), eax);
-  LCmpT* result = new(zone()) LCmpT(context, left, right);
-  return MarkAsCall(DefineFixed(result, eax), instr);
+  return MarkAsCall(new(zone()) LCompareGenericAndBranch(context, left, right),
+                    instr);
 }