along with "[arm64] Fix i/d cache line size confusion typo"
and "Fix a warning about inline asm source/destination mismatches..."
which were building on it.

This reverts the following commits:
8d7399f9
474e6a3d
c3ff68b6

Reason for revert: We're getting a large number of crash reports from
arm64 devices that are obviously related to cache flushing after code
patching. Bisection results say that the problems started at revision
c3ff68b6. Since I can't find a bug in that CL except for the typo that
I've fixed in 474e6a3d (which made some of the crashes go away but not
all of them), we have no choice but to revert the changes in order to
get stability under control while we investigate.

BUG=chromium:594646
LOG=n

Review URL: https://codereview.chromium.org/1806853002

Cr-Commit-Position: refs/heads/master@{#34816}