Allow to specify multiple -fsanitize-blacklist= arguments.

Summary:
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).

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

Test Plan: regression test suite

Reviewers: timurrrr

Subscribers: cfe-commits, kcc, pcc

Differential Revision: http://reviews.llvm.org/D7368

llvm-svn: 228156

clang/lib/Frontend/CompilerInvocation.cpp

@@ -1669,7 +1669,7 @@ static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
   Opts.SanitizeAddressFieldPadding =
       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
-  Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
+  Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
 }
 
 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,