[heap] Move RegExpResultCache out of the heap.

src/regexp/jsregexp.h

Index: src/regexp/jsregexp.h
diff --git a/src/regexp/jsregexp.h b/src/regexp/jsregexp.h
index 39e702149d2294882adb4cf4c6a6e3d97c00dcc7..760d37862b3db3d6ecf366afe829c5873781071d 100644
--- a/src/regexp/jsregexp.h
+++ b/src/regexp/jsregexp.h
@@ -1659,6 +1659,30 @@ class RegExpEngine: public AllStatic {
 };
 
 
-} }  // namespace v8::internal
+class RegExpResultsCache : public AllStatic {
+ public:
+  enum ResultsCacheType { REGEXP_MULTIPLE_INDICES, STRING_SPLIT_SUBSTRINGS };
+
+  // Attempt to retrieve a cached result.  On failure, 0 is returned as a Smi.
+  // On success, the returned result is guaranteed to be a COW-array.
+  static Object* Lookup(Heap* heap, String* key_string, Object* key_pattern,
+                        ResultsCacheType type);
+  // Attempt to add value_array to the cache specified by type.  On success,
+  // value_array is turned into a COW-array.
+  static void Enter(Isolate* isolate, Handle<String> key_string,
+                    Handle<Object> key_pattern, Handle<FixedArray> value_array,
+                    ResultsCacheType type);
+  static void Clear(FixedArray* cache);
+  static const int kRegExpResultsCacheSize = 0x100;
+
+ private:
+  static const int kArrayEntriesPerCacheEntry = 4;
+  static const int kStringOffset = 0;
+  static const int kPatternOffset = 1;
+  static const int kArrayOffset = 2;
+};
+
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_REGEXP_JSREGEXP_H_