Store transition on HStoreNamedField as HConstant.

Store transition on HStoreNamedField as HConstant.

This allows optimization passes that run in the parallel compiler thread
to use the map that a store transitions to for further analysis even
though the map handle cannot be dereferenced.

R=jkummerow@chromium.org

Committed: http://code.google.com/p/v8/source/detail?r=16028

[Jakob Kummerow, 2013-08-02 08:28:18]

lgtm

[Michael Starzinger, 2013-08-02 11:25:05]

Committed patchset #1 manually as r16028 (presubmit successful).