A64: Improve constraints for StoreNamedField

Improve register constraints for cases that don't need write barriers, and
remove TODOs.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/189373006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19807 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Invalidate OS-specific datetime cache on configuration change notification

When V8 is informed that the system's date time configuration has changed,
it should also drop its OS-specific caches of time zone information

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/193933002

Patch from James Robinson <jamesr@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19808 ce2b1a6d-e550-0410-aec6-3dcde31c8c00