Implement move semantics for the LocalAllocationBuffer as noted in
the comments. Also moved Close() invocation out of the assignment
operator and renamed it to CloseWithFiller().

Bug: v8:10315
Change-Id: Idc36fb7923e1f8857c05ec5d5110fa16087b07e7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2170087Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67428}