Inactive live ranges are ordered by their next start, so in
UpdateDeferredFixedRanges, we can stop the search for conflicts as soon
as the next start is after the end of the current extent of deferred
code.

Bug: v8:11861
Change-Id: I114eb776c8228948ecca68d105224b121be8931b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960950Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75149}