[PATCH] [ASan] Get fake stack code working with GCC 4.8.2.

[Jay Foad]

Hi kcc, samsonov,

In GCC 4.8.2, -fno-builtin is not enough to stop the compiler from
recognizing a memset-like loop and turning it into a call to memset.
You have to add -fno-tree-loop-distribute-patterns.
See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888

On my PowerPC64 box this was causing problems in the fake stack code.
__asan_stack_malloc_4 calls OnMalloc calls SetShadow which has a
memset-like loop. The compiler turned it into a call to memset, which
got intercepted by __asan_memset, which got upset because it was
being called on an address in high shadow memory.

This fixes TestCases/Linux/heavy_uar_test.cc.

http://reviews.llvm.org/D6266

Files:
  CMakeLists.txt
  cmake/config-ix.cmake
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