[PATCH] AArch32 target support

[Bernie Ogden]

The attached patches-for-review build on a pair of patches I've submitted to
llvm-commits for ARM v8 AArch32 support. They tell the clang driver about
the Cortex A53 & A57 CPUs, invoke the GNU linker with the right fpu option
and deal with the various combinations of FP/NEON/Crypto support. 

I've a couple of specific queries:

1) I've followed a policy of supporting non-Darwin targets only. Is the
right thing to do, or should I add support for Darwin too?

2) There is some support for dealing with different combinations of
FP/NEON/Crypto features. Here I've got some plumbing (in patch 0003) to add
a predefine for v8 FP, but I'm not sure what predefine to set here. The
existing code has predefines of the form __ARM_VFPV4__, which do not exist
in GCC. I would be grateful if someone could tell me what these predefines
are for and whether I need to add another for v8 FP.

Regards,

Bernie
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