Native construction of RegExp result objects, with in-object index and input.

src/codegen.h

Index: src/codegen.h
diff --git a/src/codegen.h b/src/codegen.h
index d4518e6c3dcb0447ec90f1a68afd1b5291631e0a..d56d4eee20d26bced9fb90c905145b0c1531c967 100644
--- a/src/codegen.h
+++ b/src/codegen.h
@@ -123,6 +123,7 @@ namespace internal {
   F(SubString, 3, 1)                                                         \
   F(StringCompare, 2, 1)                                                     \
   F(RegExpExec, 4, 1)                                                        \
+  F(RegExpConstructResult, 3, 1)                                             \
   F(NumberToString, 1, 1)                                                    \
   F(MathPow, 2, 1)                                                           \
   F(MathSin, 1, 1)                                                           \