Reland "Avoid some unnecessary fast-properties map creations."

Reland "Avoid some unnecessary fast-properties map creations."

This relands commit ea74f0f85a7730879a2f17721629f93525886092.

The revert was due to failures in cctest/test-heap/ReleaseOverReservedPages,
caused by apparent changes to memory layout and fragmentation of the
first page. Eliminating a situation in messages.js where this CL has had
an effect on map transitions seems to solve the issue.

R=verwaest@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=25266

[Jakob Kummerow, 2014-11-11 15:20:19]

jkummerow@chromium.org changed reviewers:
+ verwaest@chromium.org

[Jakob Kummerow, 2014-11-11 15:20:19]

PTAL. 

cctests pass on Linux in ia32.{release,optdebug,debug}.

[Toon Verwaest, 2014-11-11 15:22:56]

lgtm

[Jakob Kummerow, 2014-11-11 15:41:04]

Committed patchset #2 (id:20001) manually as 25266 (presubmit successful).