GetBytecodeArrayRegisterCount is still missing.

Bug: v8:7790
Change-Id: I7255e60ef13e48a514cc09231cdb3cc42328d441
Reviewed-on: https://chromium-review.googlesource.com/1181568Reviewed-by: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55248}