Revert "[optimizing] Improve x86 shifts"

This reverts commit 222fcf96c9b73bbb739012575e7e413caf9348ec.

Reverting this CL as it is breaking a few tests (see http://build.chromium.org/p/client.art/builders/host-x86/builds/3251/steps/test%20optimizing/logs/stdio).  Will investigate ASAP.

Change-Id: Iddd8363e83a24aa49fbdf0f0c9dc12e63b4848de
4 files changed