[PATCH] Establish subtarget features for AArch32

[Bernie Ogden]

Hi,

Attached are a pair of patches for review. They relate to targetting ARMv8
cores in the AArch32 (i.e. ARM) backend.

The first patch adds suitable subtarget features to the existing support for
Cortex-A53 and the same features as the defaults for v8. The second adds
support for Cortex-A57.

Note that these patches cause some implicit defaults to change - for
example, we now assume FP support.

Regards,

Bernie
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