[regexp] Experimental support for regexp named captures

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index bb00506640d83644c2b608287d3522ce641d421a..300c9f5c8dbda01cf85bf0db9cd9e74e051e0031 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7934,7 +7934,6 @@ class JSRegExp: public JSObject {
   // NOT_COMPILED: Initial value. No data has been stored in the JSRegExp yet.
   // ATOM: A simple string to match against using an indexOf operation.
   // IRREGEXP: Compiled with Irregexp.
-  // IRREGEXP_NATIVE: Compiled to native code with Irregexp.
   enum Type { NOT_COMPILED, ATOM, IRREGEXP };
   enum Flag {
     kNone = 0,
@@ -8027,8 +8026,11 @@ class JSRegExp: public JSObject {
   static const int kIrregexpMaxRegisterCountIndex = kDataIndex + 4;
   // Number of captures in the compiled regexp.
   static const int kIrregexpCaptureCountIndex = kDataIndex + 5;
+  // Maps names of named capture groups (at indices 2i) to their corresponding
+  // capture group indices (at indices 2i + 1).
+  static const int kIrregexpCaptureNameMapIndex = kDataIndex + 6;
 
-  static const int kIrregexpDataSize = kIrregexpCaptureCountIndex + 1;
+  static const int kIrregexpDataSize = kIrregexpCaptureNameMapIndex + 1;
 
   // Offsets directly into the data fixed array.
   static const int kDataTagOffset =