Define crc32 intrinsic builtin for gcc

This will fix the build for gcc@aarch64, enabling building V8
with gcc for aarch64.

Bug: 1066302
Change-Id: I4818d6384553a877f6c1c240b7f0c66c8db69b1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315440


Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#792504}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5e8c7fc7637af36013923f0cb6147c6377060dec