[PATCH] InstrProf: support PowerPC64

[Jay Foad]

Hi dexonsmith, kcc,

I don't know anything about profiling but it seems to work out of the
box on PowerPC64. At least "make check-profile" works.

A few tests needed tweaking because PowerPC64 IR declares main with
"define signext i32 @main" instead of just "define i32 @main".

This also fixes the asan asan_and_llvm_coverage_test test, which
compiles with -coverage so requires that a profiling version of
libclang_rt has been built.

http://reviews.llvm.org/D6233

Files:
  cmake/config-ix.cmake
  test/profile/instrprof-without-libc.c
  test/profile/instrprof-write-file-only.c
  test/profile/instrprof-write-file.c
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