It looks like we are not putting doubles into the constant pool
on arm any time soon, so lets remove this feature.

A follow-up CL will remove the 64bit support from the constant pool.

Bug: v8:8054
Change-Id: I87865a9c252c8967b5ac71b4db5d8c3b93a0e705
Reviewed-on: https://chromium-review.googlesource.com/1174531Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55152}