Replace long sequences of popq with a Drop(int) macro instruction.

vm/assembler_x64.h

Index: vm/assembler_x64.h
===================================================================
--- vm/assembler_x64.h	(revision 7659)
+++ vm/assembler_x64.h	(working copy)
@@ -489,6 +489,8 @@
    */
   void AddImmediate(Register reg, const Immediate& imm);
 
+  void Drop(intptr_t stack_elements);

[siva, 2012/05/15 21:58:59]

Why call it Drop and not PopElements which seems more readable?

[regis, 2012/05/15 22:12:45]

I agree with Siva. Also, stack_elements does not evoke a count or number.
PopqN(int n), PopWords(int word_count), PopElements(int num_elements), etc...
would all be preferable.
I am not sure an intptr_t is necessary either.
Just giving a hard time to Florian on his first commit :-)

+
   void LoadObject(Register dst, const Object& object);
   void PushObject(const Object& object);
   void CompareObject(Register reg, const Object& object);