[PATCH] ARM: Add command line option to select big or little endian

[Christian Pirker]

Hi All,

I added -EL to select little endian and -EB to select big endian ARM targets.
I also added -mlittle-endian as alias for -EL and -mbig-endian as alias for -EB.

Little endian (as e.g. for armv7):
--target=armv7
--target=armv7 -EL
--target=armv7 -mlittle-endian
--target=armebv7 -EL
--target=armebv7 -mlittle-endian

Big endian (as e.g. for armv7):
--target=armebv7
--target=armv7 -EB
--target=armv7 -mbig-endian
--target=armebv7 -EB
--target=armebv7 -mbig-endian

This patch is similar to D3215 for AArch64.
For the ARM target, I implemented the functionality in ToolChain::ComputeLLVMTriple, similar to the -mthumb option.
For the AArch64 target, I implemented the functionality in computeTargetTriple, similar to the MIPS implementation.

Please review.

Thanks,
Christian

http://reviews.llvm.org/D3307

Files:
  include/clang/Driver/Options.td
  lib/Driver/ToolChain.cpp
  test/Driver/arm-cortex-cpus.c
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