[PATCH] Allow to specify multiple -fsanitize-blacklist= arguments.

[Alexey Samsonov]

Hi timurrrr,

Allow user to provide multiple blacklists by passing several
-fsanitize-blacklist= options. These options now don't override
default blacklist from Clang resource directory, which is always
applied (which fixes PR22431).

-fno-sanitize-blacklist option now disables all blacklists that
were specified earlier in the command line (including the default
one).

Expand the test case to check that both -fsanitize-blacklist= values are handled.

This change depends on http://reviews.llvm.org/D7367.

http://reviews.llvm.org/D7368

Files:
  include/clang/Basic/LangOptions.h
  include/clang/Basic/SanitizerBlacklist.h
  include/clang/Driver/SanitizerArgs.h
  lib/AST/ASTContext.cpp
  lib/Basic/LangOptions.cpp
  lib/Basic/SanitizerBlacklist.cpp
  lib/CodeGen/BackendUtil.cpp
  lib/Driver/SanitizerArgs.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/Driver/fsanitize-blacklist.c

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