[regexp] Named capture support for callable replacements

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 0f666d7ec74ab04fe16dc1ff3128236907b64196..b328371a8559f9cb74dfe35fb64a66adf06baa53 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -7000,6 +7000,11 @@ String* JSRegExp::Pattern() {
   return pattern;
 }
 
+Object* JSRegExp::CaptureNameMap() {
+  DCHECK(this->data()->IsFixedArray());
+  DCHECK_EQ(TypeTag(), IRREGEXP);
+  return DataAt(kIrregexpCaptureNameMapIndex);
+}
 
 Object* JSRegExp::DataAt(int index) {
   DCHECK(TypeTag() != NOT_COMPILED);