[PATCH] Check for null pointers in ubsan

[Nuno Lopes]

gcc 4.9 just got more aggressive and is now exploiting the fact that input pointers to memcpy/memmove cannot be null (even if the size is 0).
This patch adds support to ubsan to check for this UB. Very important since it's already being exploited by gcc.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9673

Files:
  lib/CodeGen/CGBuiltin.cpp
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CodeGenFunction.h
  test/CodeGen/catch-undef-behavior.c

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