[regexp] Port test, match, and search

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 213e8850fd8a16d808cfe5be7e4c22b1d343faea..378e0be7022eedcf1f3d3165ae3052a6b500a744 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -8551,6 +8551,9 @@ 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;