Shrink the size of deoptimization_counter_ and kind_tag_ fields. This

vm/raw_object.h

Index: vm/raw_object.h
===================================================================
--- vm/raw_object.h	(revision 12152)
+++ vm/raw_object.h	(working copy)
@@ -616,8 +616,8 @@
   intptr_t num_optional_positional_parameters_;
   intptr_t num_optional_named_parameters_;
   intptr_t usage_counter_;  // Incremented while function is running.

[srdjan, 2012/09/12 06:37:05]

Why not move the numbers of parameters to uint16 as well?
The usage_counter could be int32_t, which would help on x64 architectures.

[regis, 2012/09/12 15:42:27]

I would be reluctant to restrict the maximum number of parameters to 64K
(uint32_t). I can well imagine tests targeting this limitation.
However, since positional and named optional parameters are mutually exclusive,
one intptr_t field and one bool field would suffice. The problem is that a bool
field does not save us anything with the current layout of existing fields.

-  intptr_t deoptimization_counter_;
-  intptr_t kind_tag_;
+  uint16_t deoptimization_counter_;
+  uint16_t kind_tag_;
 };