Revert "Re-enable global load elimination after fixing misaligned load/stores."

This reverts commit r17315 for breaking the webkit tests.

TBR=titzer@chromium.org

Review URL: https://codereview.chromium.org/34853002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17316 ce2b1a6d-e550-0410-aec6-3dcde31c8c00