Fix multiple V8::Dispose calls since r16563.

R=svenpanne@chromium.org
BUG=v8:2744
TEST=cctest/test-api/InitializeAndDisposeMultiple

Review URL: https://codereview.chromium.org/23775007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16565 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix polymorphic INTERCEPTOR StoreICs on ARM/MIPS

BUG=chromium:284998
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/23990004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16566 ce2b1a6d-e550-0410-aec6-3dcde31c8c00