With the landing of the callee saves patch in change set r189575: <http://trac.webkit.org/changeset/189575>, there is no longer a need for register preservation and restoration thunks and the code that generates them.
Created attachment 261491 [details] Patch
Created attachment 261493 [details] Patch with Speculative CMake Build Fix
Comment on attachment 261493 [details] Patch with Speculative CMake Build Fix r=me
Created attachment 261504 [details] Patch with deletion of more related code
Comment on attachment 261504 [details] Patch with deletion of more related code r=me
Committed r189967: <http://trac.webkit.org/changeset/189967>