[PATCH] [ARM] Emit the build attribtue Tag_CPU_unaligned_access

[Charlie Turner]

Hi Renato & Jon,

Thank you both for the reviews.

I have split my patch into three (figured I may as well split the actual refactoring from the v6M aligned access clarification while I was at it) and incorporated Rento's suggestions.

> Have you used Phabricator?

No, I will use this in the future if it is preferred.

> Also, the CHECK like could be merged into two:

Whoops, thanks for spotting that!

Please find the patch set attached.

Thanks,
Charlie.
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