This removes a couple of intrinsics/runtime functions/macros that are no
longer needed at all (or not in TurboFan for performance reasons).

Bug: v8:8015
Change-Id: I08ae8de7cc63019eb30d3b71dd1c824d6392076a
Reviewed-on: https://chromium-review.googlesource.com/1183481Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55277}