A64: Improve the code sequence generated for deoptimization exits.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/200143002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19942 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix a race in initialization of timezone cache in platform-win32.

This allocates a timezone cache per isolate.

BUG=
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/197023002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19943 ce2b1a6d-e550-0410-aec6-3dcde31c8c00