This removes support for dropping arguments adaptor frames as part of
the JSFunction-to-JSFunction tail-call mechanism. The need for having
dedicated {kArchTailCallJSFunctionFromJSFunction} instructions is gone.

R=bmeurer@chromium.org
BUG=v8:4698

Change-Id: Id3d35d06800bee68e06b9554c4315e6ad304de5f
Reviewed-on: https://chromium-review.googlesource.com/575975Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46782}