ThinLTO emits warnings when linking modules with different target
triples. Android uses armv7-a as its default triple, so the mixing with
armv8-a here is problematic.

Bug: 807147
Test: md5sum <(objdump -d crc32_simd.o) is the same for Android.
Change-Id: If2bffc4090d3d94f158eea80d19ee9eb827fc837
Reviewed-on: https://chromium-review.googlesource.com/1147867


Commit-Queue: George Burgess <gbiv@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#585338}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 708d7d6be05885487cb5ccdffeab08a09ab1ea60