- Fix a lot of warnings generated by -Wshorten-64-to-32

runtime/vm/os.h

Index: runtime/vm/os.h
===================================================================
--- runtime/vm/os.h	(revision 38492)
+++ runtime/vm/os.h	(working copy)
@@ -65,7 +65,7 @@
 
   // Returns the activation frame alignment constraint or one if
   // the platform doesn't care. Guaranteed to be a power of two.
-  static word ActivationFrameAlignment();
+  static intptr_t ActivationFrameAlignment();
 
   // This constant is guaranteed to be greater or equal to the
   // preferred code alignment on all platforms.
@@ -73,11 +73,8 @@
 
   // Returns the preferred code alignment or zero if
   // the platform doesn't care. Guaranteed to be a power of two.
-  static word PreferredCodeAlignment();
+  static intptr_t PreferredCodeAlignment();
 
-  // Returns the stack size limit.
-  static uword GetStackSizeLimit();
-
   // Returns true if StackFrameIterator can be used from an isolate that isn't
   // the calling thread's current isolate.
   static bool AllowStackFrameIteratorFromAnotherThread();