[PATCH] MCJIT SubArch detection support

[Renato Golin]

Hi Tim,

Following the failure of the ARMv5 bot and our lack of interest in it
passing, I created a patch to the MCJIT unit test which detects if it's
compatible with sub-architectures provided by the triple's "ArchName".

This will allow us to continue running tests on future ARM hardware but not
on old ones.

Should I have added "armv8" as well?

I've tested and debugged on Intel, Cortex-A15 and 2 different Cortex-A9 and
the detection works on all of them. I don't have an ARMv5 here, but I'm
confident it'll work on the bot.

Ok to commit?

cheers,
--renato
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