Enforce length/size limits for variable size heap object in order to

vm/os.h

Index: vm/os.h
===================================================================
--- vm/os.h	(revision 10127)
+++ vm/os.h	(working copy)
@@ -44,6 +44,10 @@
   // the platform doesn't care. Guaranteed to be a power of two.
   static word ActivationFrameAlignment();
 
+  // This constant is guaranteed to be greater or equal to the
+  // preferred code alignment on all platforms.
+  static const int kMaxPreferredCodeAlignment = 32;
+
   // Returns the preferred code alignment or zero if
   // the platform doesn't care. Guaranteed to be a power of two.
   static word PreferredCodeAlignment();