[PATCH] [ARM] Add support for Cortex-R4/R4F in LLVM

[Javed Absar]

Currently, llvm (backend) doesn't know cortex-r4, even though it is the default target for armv7r. Using "--target=armv7r-arm-none-eabi" provokes
'cortex-r4' is not a recognized processor for this target (ignoring processor)' by llvm.

This patch adds support for cortex-r4 and, very closely related. r4f.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8699

Files:
  lib/Target/ARM/ARM.td
  lib/Target/ARM/ARMSubtarget.h
  test/CodeGen/ARM/build-attributes.ll
  test/CodeGen/ARM/div.ll
  test/CodeGen/Thumb2/div.ll

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