[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 63abfbc6729cdf7d6232c58dcd4ece00c73edf0c..2ea5d600c980890b4c8ee734d1d695466e3c9908 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -6961,6 +6961,13 @@ String* JSRegExp::Pattern() {
   return pattern;
 }
 
+Object* JSRegExp::CaptureNameMap() {
+  DCHECK(this->data()->IsFixedArray());
+  DCHECK_EQ(TypeTag(), IRREGEXP);
+  Object* value = DataAt(kIrregexpCaptureNameMapIndex);
+  DCHECK_NE(value, Smi::FromInt(JSRegExp::kUninitializedValue));
+  return value;
+}
 
 Object* JSRegExp::DataAt(int index) {
   DCHECK(TypeTag() != NOT_COMPILED);