Support %_IsConstructCall in Crankshaft pipeline.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index c5f7b3b626456c127d6ddd278b021c1cb44f5a06..febf2f770effb1090a00184e7164e84d9dd3d5a1 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1082,6 +1082,8 @@ LInstruction* LChunkBuilder::DoTest(HTest* instr) {
     } else if (v->IsTypeofIs()) {
       HTypeofIs* typeof_is = HTypeofIs::cast(v);
       return new LTypeofIsAndBranch(UseTempRegister(typeof_is->value()));
+    } else if (v->IsIsConstructCall()) {
+      return new LIsConstructCallAndBranch(TempRegister());
     } else {
       if (v->IsConstant()) {
         if (HConstant::cast(v)->handle()->IsTrue()) {
@@ -1763,6 +1765,12 @@ LInstruction* LChunkBuilder::DoTypeofIs(HTypeofIs* instr) {
   return NULL;
 }
 
+
+LInstruction* LChunkBuilder::DoIsConstructCall(HIsConstructCall* instr) {
+  return DefineAsRegister(new LIsConstructCall);
+}
+
+
 LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
   HEnvironment* env = current_block_->last_environment();
   ASSERT(env != NULL);