Port IsConstructCall optimization to x64 and ARM.

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
===================================================================
--- src/x64/codegen-x64.cc	(revision 2380)
+++ src/x64/codegen-x64.cc	(working copy)
@@ -3235,10 +3235,25 @@
 
 
 void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
-  // TODO(X64): Optimize this like it's done on IA-32.
   ASSERT(args->length() == 0);
-  Result answer = frame_->CallRuntime(Runtime::kIsConstructCall, 0);
-  frame_->Push(&answer);
+
+  // Get the frame pointer for the calling frame.
+  Result fp = allocator()->Allocate();
+  __ movq(fp.reg(), Operand(rbp, StandardFrameConstants::kCallerFPOffset));
+
+  // Skip the arguments adaptor frame if it exists.
+  Label check_frame_marker;
+  __ cmpq(Operand(fp.reg(), StandardFrameConstants::kContextOffset),
+          Immediate(ArgumentsAdaptorFrame::SENTINEL));
+  __ j(not_equal, &check_frame_marker);
+  __ movq(fp.reg(), Operand(fp.reg(), StandardFrameConstants::kCallerFPOffset));
+
+  // Check the marker in the calling frame.
+  __ bind(&check_frame_marker);
+  __ cmpq(Operand(fp.reg(), StandardFrameConstants::kMarkerOffset),
+          Immediate(Smi::FromInt(StackFrame::CONSTRUCT)));
+  fp.Unuse();
+  destination()->Split(equal);
 }