[regexp] Experimental support for regexp named captures

src/regexp/jsregexp.h

Index: src/regexp/jsregexp.h
diff --git a/src/regexp/jsregexp.h b/src/regexp/jsregexp.h
index e55d650fab14316e10c34e75fc9f3b4a79be2169..dc8aee1b035288a7e81208f44387fc235016bcd1 100644
--- a/src/regexp/jsregexp.h
+++ b/src/regexp/jsregexp.h
@@ -196,6 +196,8 @@ class RegExpImpl {
   // For acting on the JSRegExp data FixedArray.
   static int IrregexpMaxRegisterCount(FixedArray* re);
   static void SetIrregexpMaxRegisterCount(FixedArray* re, int value);
+  static void SetIrregexpCaptureNameMap(FixedArray* re,
+                                        Handle<FixedArray> value);
   static int IrregexpNumberOfCaptures(FixedArray* re);
   static int IrregexpNumberOfRegisters(FixedArray* re);
   static ByteArray* IrregexpByteCode(FixedArray* re, bool is_one_byte);
@@ -1530,6 +1532,7 @@ struct RegExpCompileData {
   RegExpNode* node;
   bool simple;
   bool contains_anchor;
+  Handle<FixedArray> capture_name_map;
   Handle<String> error;
   int capture_count;
 };