[PATCH] Enable FeatureMP for Cortex-A5 by default

[Oliver Stannard]

Hi all,

These patches enables FeatureMP by default for Cortex-A5 processors, and
test that the correct build attributes are emitted when compiling for
Cortex-A5.

The reason for this is that the majority of developers using LLVM for
Cortex-A5 will be developing "application" style software, where most
Cortex-A5 CPUs will be Cortex-A5MP. Those developers using LLVM for
deeply-embedded software may still need to target Cortex-A5 without the MP
extension, but are also more likely to know the exact features of the
hardware they are targeting, and so set the enabled features correctly. The
same logic applies equally well to the default enabling of optional features
of other Cortex-A* cores.

Oliver
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