[PATCH] Enable vmla.f32 generation on Cortex-A15

[Silviu Baranga]

Hi,

The attached patch enables the generation of vmla.f32 instructions
for Cortex-A15 CPUs.

To patch disables the MLxExpansion pass and modifies the
"hasNoVMLxHazardUse" function (this was preventing the vmla.f32
instructions from being selected).

This also adds the VFPv4 feature for Cortex-A15 and tweaks the
DontUseFusedMAC predicate (the previous logic disabled vmla.f32
generation on all CPUs with VFPv4 on non-Darwin targets).

Please review!

Thanks,
Silviu

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