[PATCH] Using ARMTargetParser in Clang

[Renato Golin]

Hi echristo, rnk, t.p.northover, john.brawn, meadori,

This is a starting point for using the TargetParser in Clang, in a simple
enough part of the code that can be used without disrupting the crazy
platform support that we need to be compatible with other toolchains.

Also adding a few FIXME on obvious places that need replacing, but those
cases will indeed break a few of the platform assumptions, as arch/cpu names
change multiple times in the driver.

Finally, I'm changing the "neon-vfpv3" behaviour to match standard NEON, since
-mfpu=neon implies vfpv3 by default in both Clang and LLVM. That option
string is still supported as an alias to "neon".

This patch depends on D9435 for support in LLVM.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9549

Files:
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  test/Driver/arm-mfpu.c

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