Add runtime function for string to array conversion.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 2a347cd6fd0e0f2eda7ffe434693039646f11342..74f492b6e0f3c76d13f3c411e457a736777d0d61 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -45,6 +45,10 @@ class Factory : public AllStatic {
       int size,
       PretenureFlag pretenure = NOT_TENURED);
 
+  // Allocate a new uninitialized fixed array. It must be filled by
+  // the caller.
+  static Handle<FixedArray> NewUninitializedFixedArray(int size);
+
   // Allocate a new fixed array with non-existing entries (the hole).
   static Handle<FixedArray> NewFixedArrayWithHoles(int size);