Reviewers: Hannes Payer,

Message:
PTAL

Description:
Add code age subtype tracking to --track-gc-object-stats

Adds counters which track the age of code in the heap during a gc if
--track-gc-object-stats is enabled.

- Splits RecordObjectStats into RecordObjectStats, RecordCodeSubTypeStats and
   RecordFixedArraySubTypeStats.
 - Renames kNoAge to kNoAgeCodeAge to follow other code age enums and enable
   the name to be used in Macro based initialization of the counters.

BUG=None

Please review this at https://codereview.chromium.org/26179004/

SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge

Affected files (+91, -52 lines):
  M src/arm/codegen-arm.cc
  M src/builtins.h
  M src/heap.h
  M src/heap.cc
  M src/ia32/codegen-ia32.cc
  M src/mark-compact.cc
  M src/mips/codegen-mips.cc
  M src/objects.h
  M src/objects.cc
  M src/v8-counters.h
  M src/v8-counters.cc
  M src/x64/codegen-x64.cc


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