[PATCH] Add support for cross-compilation and running under qemu to utils/ABITest/

[Daniel Sanders]

Cross-compilers can be used by setting X_COMPILER, Y_COMPILER, and CC to
the compilers to be used. The tests can be executed using a RUNUNDER script
much like the test-suite.

Also added Makefiles for testing the MIPS O32/N32/N64 ABI's in big/little
endian as well as with hard/soft-float (via SOFTFLOAT=1)

http://reviews.llvm.org/D4810

Files:
  utils/ABITest/Makefile.test.common
  utils/ABITest/mips-n32/Makefile
  utils/ABITest/mips-n64/Makefile
  utils/ABITest/mips-o32/Makefile
  utils/ABITest/mipsel-n32/Makefile
  utils/ABITest/mipsel-n64/Makefile
  utils/ABITest/mipsel-o32/Makefile
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