[PATCH][ARM] Added support for krait cpu

[Ana Pazos]

Hello reviewers,

 

These patches add support for krait cpu in Clang and LLVM.

 

Notes:

-        Krait processor currently modeled as cortex-a9 and reuses the same
instruction itineraries.

-        Krait additionally has VFP4 (fused multiply add/sub) and hardware
division features enabled.

-        Krait cpu is not recognized by the GNU assembler, so it is replaced
with march=armv7-a to avoid a lower march from being used.

 

Let me know what you think.

 

Thanks,

Ana.

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