Revert of Reland "ARM64: Add NEON support"

Revert of Reland "ARM64: Add NEON support" (patchset #3 id:20001 of https://codereview.chromium.org/2812573003/ )

Reason for revert:
blocks roll: https://codereview.chromium.org/2820753003/

Original issue's description:
> Reland "ARM64: Add NEON support"
> 
> This reverts commit cc047635ff54ce19b12cc91978971795f670767d.
> The CL was reverted due to a missing DEPS mirror.
> 
> Original issue's description:
> > ARM64: Add NEON support
> >
> > Add assembler, disassembler and simulator support for NEON in the ARM64 backend.
> >
> > BUG=
> >
> > Review-Url: https://codereview.chromium.org/2622643005
> > Cr-Commit-Position: refs/heads/master@{#44306}
> 
> BUG=
> 
> Review-Url: https://codereview.chromium.org/2812573003
> Cr-Commit-Position: refs/heads/master@{#44652}
> Committed: https://chromium.googlesource.com/v8/v8/+/8faf3d6f25096fb68e4fed4f772bb7052192d704

TBR=bmeurer@chromium.org,bbudge@chromium.org,machenbach@chromium.org,martyn.capewell@arm.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=