Increase the size of the max object that can be new space allocated.

This is neutral on in-browser SunSpider, but beneficial on other
things, and is likely to lower memory use by collecting earlier.
Review URL: http://codereview.chromium.org/5753003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5968 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.h

@@ -1119,9 +1119,9 @@ class Heap : public AllStatic {
   static int contexts_disposed_;
 
 #if defined(V8_TARGET_ARCH_X64)
-  static const int kMaxObjectSizeInNewSpace = 512*KB;
+  static const int kMaxObjectSizeInNewSpace = 1024*KB;
 #else
-  static const int kMaxObjectSizeInNewSpace = 256*KB;
+  static const int kMaxObjectSizeInNewSpace = 512*KB;
 #endif
 
   static NewSpace new_space_;