[PATCH] [mips] Don't propagate -mfpxx by default if soft/single float were also set.

[Toma Tabacu]

Hi dsanders, atanasyan,

If the driver is only given -msoft-float/-mfloat-abi=soft or -msingle-float,
we should refrain from propagating -mfpxx, unless it was explicitly given on the
command line.

http://reviews.llvm.org/D10387

Files:
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/mips-as.c
  test/Driver/mips-features.c
  test/Driver/mips-integrated-as.s

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