Wrap PushLoad and BuildStoreInEffect in CHECK_ALIVE.

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23903017

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16558 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Prepare push to trunk.  Now working on version 3.21.12.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/23519008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16559 ce2b1a6d-e550-0410-aec6-3dcde31c8c00