Direct call to native RegExp code from JavaScript

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
===================================================================
--- src/x64/codegen-x64.cc	(revision 3531)
+++ src/x64/codegen-x64.cc	(working copy)
@@ -3880,6 +3880,19 @@
 }
 
 
+void CodeGenerator::GenerateRegExpExec(ZoneList<Expression*>* args) {
+  ASSERT_EQ(args->length(), 4);
+
+  // Load the arguments on the stack and call the runtime system.
+  Load(args->at(0));
+  Load(args->at(1));
+  Load(args->at(2));
+  Load(args->at(3));
+  Result result = frame_->CallRuntime(Runtime::kRegExpExec, 4);
+  frame_->Push(&result);
+}
+
+
 void CodeGenerator::GenerateStringAdd(ZoneList<Expression*>* args) {
   ASSERT_EQ(2, args->length());