[PATCH] [ARM] Change default ABI for AArch32 to be "aapcs" (was "apcs-gnu")

[Oliver Stannard]

The current default abi when no environment is given is "apcs-gnu",
which is obsolete. This patch changes the default to "aapcs". "aapcs" has both
hard- and soft-float variants, so the -mhard-float, -msoft-float and
-mfloat-abi= options now all behave as expected when no environment is
specified in the triple.

While writing this I also noticed that a preprocessor test claims to be
checking darwin, but is actually checking the defaults, which are
different for darwin.

http://reviews.llvm.org/D5096

Files:
  lib/Driver/Tools.cpp
  test/Driver/arm-abi.c
  test/Preprocessor/init.c
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