[PATCH] [UBSan] Add returns-nonnull sanitizer.

[Alexey Samsonov]

Renamed the -fsanitize= flag value to "-fsanitize=returns-nonnull-attribute" and added the documentation.
Addressed reviewer's comments.

http://reviews.llvm.org/D4849

Files:
  projects/compiler-rt/lib/ubsan/ubsan_handlers.cc
  projects/compiler-rt/lib/ubsan/ubsan_handlers.h
  projects/compiler-rt/test/ubsan/TestCases/Misc/nonnull.cpp
  tools/clang/docs/UsersManual.rst
  tools/clang/include/clang/Basic/Sanitizers.def
  tools/clang/lib/CodeGen/CGCall.cpp
  tools/clang/test/CodeGen/catch-undef-behavior.c
  tools/clang/test/Driver/fsanitize.c
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