x64 code generation for construct calls, declaring global variables...

src/x64/ic-x64.cc

Index: src/x64/ic-x64.cc
===================================================================
--- src/x64/ic-x64.cc	(revision 2254)
+++ src/x64/ic-x64.cc	(working copy)
@@ -206,7 +206,7 @@
   // Check if the receiver is a global object of some sort.
   Label invoke, global;
   __ movq(rdx, Operand(rsp, (argc + 1) * kPointerSize));  // receiver
-  __ testq(rdx, Immediate(kSmiTagMask));
+  __ testl(rdx, Immediate(kSmiTagMask));
   __ j(zero, &invoke);
   __ movq(rcx, FieldOperand(rdx, HeapObject::kMapOffset));
   __ movzxbq(rcx, FieldOperand(rcx, Map::kInstanceTypeOffset));