Fix failing test mjsunit/skipping-inner-functions on big endian
platforms.

Change-Id: If35c5a663a296fab6ad6011cf0a101133ec6a237
Reviewed-on: https://chromium-review.googlesource.com/1029954
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52875}