Sort inactive live ranges by their assigned register and by their next
start. This allows {FindFreeRegistersForRange} to stop the search earlier
and significantly reduces compile time for some test cases.

R=sigurds@chromium.org
CC=neis@chromium.org

Bug: chromium:974804, v8:9529
Change-Id: I85e2ff8acf2c02ea0539c89daae5a427da775c2c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1795350
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63722}