[simd] Disable SVE implementation of array search for GCC

GCC requires SVE enabled for the entire translation unit and does
not expose raw __builtin_sve_* builtins on a per-function basis.
Fallback to Neon if it's not built by Clang.

Refs: https://github.com/nodejs/node/pull/65161
Change-Id: I53a06fcf8f901ae0347044c6999463ce99215c45
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8223266
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Cr-Commit-Position: refs/heads/main@{#109230}