[ownership] On non-Darwin platforms start serializing the stdlib in OSSA as well.

I had to fix a memory corruption bug (see previous commit) to land this. But now
that it is fixed, we are ready!

lib/Frontend/CompilerInvocation.cpp

@@ -1204,11 +1204,6 @@ static bool ParseSILArgs(SILOptions &Opts, ArgList &Args,
       Args.hasArg(OPT_sil_stop_optzns_before_lowering_ownership);
   if (const Arg *A = Args.getLastArg(OPT_external_pass_pipeline_filename))
     Opts.ExternalPassPipelineFilename = A->getValue();
-  // If our triple is a darwin triple, lower ownership on the stdlib after we
-  // serialize.
-  if (Triple.isOSDarwin()) {
-    Opts.SerializeStdlibWithOwnershipWithOpts = true;
-  }
 
   Opts.GenerateProfile |= Args.hasArg(OPT_profile_generate);
   const Arg *ProfileUse = Args.getLastArg(OPT_profile_use);