Experimental: begin using the register allocator for switch statements...

src/virtual-frame-ia32.h

Index: src/virtual-frame-ia32.h
===================================================================
--- src/virtual-frame-ia32.h	(revision 1027)
+++ src/virtual-frame-ia32.h	(working copy)
@@ -351,8 +351,11 @@
   void Drop(int count);
 
   // Drop one element.
-  void Drop();
+  void Drop() { Drop(1); }
 
+  // Duplicate the top element of the frame.
+  void Dup() { LoadFrameSlotAt(elements_.length() - 1); }
+
   // Pop an element from the top of the expression stack.
   // Returns a Result, which may be a constant or a register.
   Result Pop();