This fixes failing tests 'ByteinRodata' and 'ByteInText' on MIPS.

Changed assemble directives for 'test_string0_bytes' and
'test_function0_bytes' from .local to .global, and reordered function
bytes according to endianess.

Change-Id: Iecac3a966a57531b41c8ce8959e16021d465520a
Reviewed-on: https://chromium-review.googlesource.com/966287
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52014}