Set maximum length of FixedArray in terms of elements instead an absolute number of bytes.

src/objects.h

Index: src/objects.h
===================================================================
--- src/objects.h	(revision 10032)
+++ src/objects.h	(working copy)
@@ -2098,7 +2098,7 @@
   // Maximal allowed size, in bytes, of a single FixedArray.
   // Prevents overflowing size computations, as well as extreme memory
   // consumption.
-  static const int kMaxSize = 512 * MB;
+  static const int kMaxSize = 128 * MB * kPointerSize;
   // Maximally allowed length of a FixedArray.
   static const int kMaxLength = (kMaxSize - kHeaderSize) / kPointerSize;
 
@@ -3339,9 +3339,6 @@
 
   static const int kAlignedSize = OBJECT_POINTER_ALIGN(kHeaderSize);
 
-  // Maximal size of a single FreeSpace.
-  static const int kMaxSize = 512 * MB;
-
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FreeSpace);
 };