Direct call to native RegExp code from JavaScript

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
===================================================================
--- src/ia32/macro-assembler-ia32.cc	(revision 3531)
+++ src/ia32/macro-assembler-ia32.cc	(working copy)
@@ -325,6 +325,17 @@
 }
 
 
+Condition MacroAssembler::IsObjectStringType(Register heap_object,
+                                             Register map,
+                                             Register instance_type) {
+  mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
+  movzx_b(instance_type, FieldOperand(map, Map::kInstanceTypeOffset));
+  ASSERT(kNotStringTag != 0);
+  test(instance_type, Immediate(kIsNotStringMask));
+  return zero;
+}
+
+
 void MacroAssembler::FCmp() {
   if (CpuFeatures::IsSupported(CMOV)) {
     fucomip();