Revert 20348 - "Fix LoadFieldByIndex to take mutable heap-numbers into account."

Revert 20348 - "Fix LoadFieldByIndex to take mutable heap-numbers into account."

Reason for revert: crashes benchmarks/sunspider/string-fasta on ia32.debug

This also reverts r20350 and r20352

> Fix LoadFieldByIndex to take mutable heap-numbers into account.
>
> BUG=
> R=ishell@chromium.org
>
> Review URL: https://codereview.chromium.org/213213002

BUG=none
LOG=n
TBR=verwaest@chromium.org

Revert "Use sarq on x64"

This reverts commit e2a8ef9321345c6bc091054443bf2b9535ff6b1c.

Revert "Don't | int and bool"

This reverts commit c90d713d3a8ceba4fec41933a63beb6e50a3d7c0.

Committed: https://code.google.com/p/v8/source/detail?r=20354

[jochen (gone - plz use gerrit), 2014-03-31 13:23:47]

Committed patchset #1 manually as r20354 (tree was closed).