Backed out changeset aa631f68a4fe (bug 972099) for causing intermittent Win8 PGO reftest crashes.
Bug 946478 - IonMonkey: Go back to just using copies to satisfy regalloc constraints for div and mod on x86/x64. r=bhackett
Bug 974189 - Black screen in content area during browser start with OMTC enabled. r=gal
Bug 974314 - Fix memleak in CreateDrawTargetForData when backend is skia. r=gal
Bug 969493 - Signaling: Consolidate IPC implementations in CPR. r=jib