[PATCH] D19555: [sanitizers] Get the proper symbol version when long double transition is involved.

[Marcin Kościelnicki via llvm-commits]

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On linux, some architectures had an ABI transition from 64-bit long double
(ie. same as double) to 128-bit long double.  On those, glibc symbols
involving long doubles come in two versions, and we need to pass the
correct one to dlvsym when intercepting them.

A few more functions we intercept are also versioned (all printf, scanf,
strtold variants), but there's no need to fix these, as the REAL() versions
are never called.

This fixes 4 FAILs on powerpc64.

Repository:
  rL LLVM

http://reviews.llvm.org/D19555

Files:
  lib/asan/asan_interceptors.cc
  lib/esan/esan_interceptors.cpp
  lib/msan/msan_interceptors.cc
  lib/sanitizer_common/sanitizer_common_interceptors.inc
  lib/sanitizer_common/sanitizer_platform.h
  lib/tsan/rtl/tsan_interceptors.cc

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