[PATCH] [compiler-rt] Remove -fomit-frame-pointer from sanitizers CFLAGS

[Alexander Potapenko]

Do you have an example where this really leads to an incorrect stack trace?
Sergey and I asked Kostya about this a couple of times and his point
was that -fomit-frame-pointer produces faster calls, but doesn't
worsen the reports, because the functions from ASan runtime library
are always on top of the stack.

http://reviews.llvm.org/D4305