[OpenMP] Add TLS-based implementation for threadprivate directive.

llvm-svn: 242080

clang/lib/Frontend/CompilerInvocation.cpp

@@ -1651,6 +1651,8 @@ static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
 
   // Check if -fopenmp is specified.
   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp);
+  Opts.OpenMPUseTLS =
+      Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
 
   // Record whether the __DEPRECATED define was requested.
   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,