Increase new space size and limits on 64-bit platforms.

Review URL: http://codereview.chromium.org/171105

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2707 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -73,6 +73,10 @@ int Heap::amount_of_external_allocated_memory_at_last_global_gc_ = 0;
 int Heap::semispace_size_  = 512*KB;
 int Heap::old_generation_size_ = 128*MB;
 int Heap::initial_semispace_size_ = 128*KB;
+#elseif defined(V8_TARGET_ARCH_X64)
+int Heap::semispace_size_  = 8*MB;
+int Heap::old_generation_size_ = 1*GB;
+int Heap::initial_semispace_size_ = 1*MB;
 #else
 int Heap::semispace_size_  = 4*MB;
 int Heap::old_generation_size_ = 512*MB;

src/heap.h

@@ -852,7 +852,11 @@ class Heap : public AllStatic {
 
   static const int kMaxMapSpaceSize = 8*MB;
 
+#if defined(V8_TARGET_ARCH_X64)
+  static const int kMaxObjectSizeInNewSpace = 512*KB;
+#else
   static const int kMaxObjectSizeInNewSpace = 256*KB;
+#endif
 
   static NewSpace new_space_;
   static OldSpace* old_pointer_space_;