Reduce the memory used by frame elements from two words to one by...

src/register-allocator.h

Index: src/register-allocator.h
===================================================================
--- src/register-allocator.h	(revision 1947)
+++ src/register-allocator.h	(working copy)
@@ -100,7 +100,9 @@
   explicit StaticType(StaticTypeEnum static_type) : static_type_(static_type) {}
 
   // StaticTypeEnum static_type_;
-  byte static_type_;
+  StaticTypeEnum static_type_;
+
+  friend class FrameElement;
 };