[PATCH] add basic support for Cortex-A7 and VFPv4 to LLVM and Clang

[Artyom Skrobov]

Hello,

The LLVM patch adds ProcessorModel<"cortex-a7">, reusing CortexA8Model but
with the feature set reflecting Cortex-A7 TRM, to ARM.td
The Clang patch adds support for -mfpu=vfp[v]4[-d16], corresponding to the
Cortex-A7 options of having a VFPv4-D16 FPU without NEON, or (by default) a
VFPv4-D32 FPU with NEON.
The latter patch also tests that the correct ACLE predefines and EABI
attributes are emitted when targeting Cortex-A7 with the various FPU
options.

OK to commit?
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