Merged r13367, r13368, r13464 into 3.15 branch.

Fix unhandlified value in GetOwnProperty function.

Fix problem with NULL handle in r13367.

Fix pattern detection for replacing shifts by rotation.

R=ulan@chromium.org
BUG=chromium:169723,chromium:169723,v8:2499
TEST=mjsunit/regress/regress-2499

Review URL: https://codereview.chromium.org/12090020

git-svn-id: https://v8.googlecode.com/svn/branches/3.15@13524 ce2b1a6d-e550-0410-aec6-3dcde31c8c00