Reviewers: Mads Ager,

Description:
Cache maps when normalizing properties.

Not for commit.

I am unsure about whether the cache should be global (as ContextSlotCache)
or per-context. I am inclined towards per-context as the information in
the cache is context-dependent, and multiple contexts would cause more
hash collisions.

Unfinished:
- some constants hardcoded
- no pre-compact cleanup



Please review this at http://codereview.chromium.org/3028019/show

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

Affected files:
  M     src/bootstrapper.cc
  M     src/contexts.h
  M     src/objects.cc
  M     src/v8-counters.h


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