Revert of [arm64] Improve some new builtins. (patchset #1 id:1 of https://codereview.chromium.org/1537903004/ )

Reason for revert:
[Sheriff] Breaks arm64 nosnap debug:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20nosnap%20-%20debug/builds/753

Original issue's description:
> [arm64] Improve some new builtins.
>
> - Simplify the variable-length pop sequence on entry. (It now uses
>   smaller code with no branches.)
> - Use conditional compare to merge branches where appropriate.
> - Make use of Ldrsw + UntagSmiFieldMemOperand to load smis more
>   efficiently.
> - Only load 'undefined' and 'null' once per builtin.
> - A few other small improvements.
>
> BUG=
>
> Committed: https://crrev.com/efc641a7be54978cd85a4dcdf1950cd97725917d
> Cr-Commit-Position: refs/heads/master@{#32975}

TBR=bmeurer@chromium.org,yangguo@chromium.org,jacob.bramley@arm.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1539073002

Cr-Commit-Position: refs/heads/master@{#32978}