Cleanup the double field tracking in Hydrogen.

Cleanup the double field tracking in Hydrogen.

Use a dedicated BuildLoadNamedField() with PropertyAccessInfo,
similar to BuildStoreNamedField() for optimized graph building,
and a dedicated BuildLoadNamedField() for the code stubs, and
don't depend on FLAG_track_double_fields during code generation.

R=verwaest@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=19411

[Benedikt Meurer, 2014-02-17 13:13:19]

PTAL

[Toon Verwaest, 2014-02-17 13:19:39]

lgtm

[Benedikt Meurer, 2014-02-17 13:23:11]

Committed patchset #1 manually as r19411 (presubmit successful).