Reviewers: Igor Sheludko,

Message:
PTAL.
Prerequisite for introducing a mutable heap number instance type (and double
unboxing).

Description:
Use MigrateToMap instead of set_map to update the map of a JSObject.
This is necessary to guarantee correct representation usage.
Some unhandlified code still needs to be handlified before we can push this
through fully.

BUG=

Please review this at https://codereview.chromium.org/194783002/

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

Affected files (+78, -91 lines):
  M src/objects.h
  M src/objects.cc


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