ArrayPush builtin handlified.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index f712880a02cd495daba0491cb08a9f2f2bd3e9af..22ec4d395ce628b04b9fc7e6e5dcb863f275c8a0 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -44,7 +44,7 @@ class Factory {
       Handle<Object> value,
       PretenureFlag pretenure = NOT_TENURED);
 
-  // Allocate a new uninitialized fixed array.
+  // Allocates a fixed array initialized with undefined values.
   Handle<FixedArray> NewFixedArray(
       int size,
       PretenureFlag pretenure = NOT_TENURED);
@@ -54,6 +54,9 @@ class Factory {
       int size,
       PretenureFlag pretenure = NOT_TENURED);
 
+  // Allocates an uninitialized fixed array. It must be filled by the caller.
+  Handle<FixedArray> NewUninitializedFixedArray(int size);
+
   // Allocate a new uninitialized fixed double array.
   Handle<FixedDoubleArray> NewFixedDoubleArray(
       int size,