deps: V8: backport a05177279022 - #67416

Original commit message:

    [temporal] Compute zoneinfo64.res length from ResB index table

    ICU4C's offsetTOCLookupFn sets UDataMemory::length = -1 for the last
    entry in a .dat archive (which occurs for zoneinfo64.res in small-icu
    builds where zu.res is excluded), and pointerTOCLookupFn sets length = -1
    for all entries in pointer TOC builds.

    When UDataMemory::length is -1, compute the bundle byte length from the
    ResB header offset (udata_getMemory(memory) - data) and the
    self-describing URES_INDEX_BUNDLE_TOP word in the ResB index table,
    matching ICU4C's res_init() in uresdata.cpp. Also check USING_SYSTEM_ICU
    in addition to V8_ENABLE_TEMPORAL_SYSTEMICU when deciding whether
    internal udatamem.h is available.

    Bug: 576986967
    Change-Id: I7a2c881eb3891a97eafb244f71aa405ff2434b51
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8642579
    Commit-Queue: Manish Goregaokar <manishearth@google.com>
    Reviewed-by: Rezvan Mahdavi Hezaveh <rezvan@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#111181}

Refs: v8/v8@a051772
Co-authored-by: Renegade334 <contact.9a5d6388@renegade334.me.uk>