[regexp] Port test, match, and search

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 552e96f18fab6259c0c2661098c552c44b7fdca5..e63bf3531715fce43c4a8da35c8ca28c04a8466c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -8517,6 +8517,9 @@ class JSRegExp: public JSObject {
   // Set implementation data after the object has been prepared.
   inline void SetDataAt(int index, Object* value);
 
+  inline void SetLastIndex(int index);
+  inline Object* LastIndex();
+
   static int code_index(bool is_latin1) {
     if (is_latin1) {
       return kIrregexpLatin1CodeIndex;