Merge pull request #23465 from adrian-prantl/48018240-irgen

Add a -public-linkage-for-metadata-accessors IRGen flag for LLDB.

lib/Frontend/CompilerInvocation.cpp

@@ -1088,6 +1088,10 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
     Opts.EnableResilienceBypass = true;
   }
 
+  if (Args.hasArg(OPT_force_public_linkage)) {
+    Opts.ForcePublicLinkage = true;
+  }
+
   // PE/COFF cannot deal with the cross-module reference to the metadata parent
   // (e.g. NativeObject).  Force the lazy initialization of the VWT always.
   Opts.LazyInitializeClassMetadata = Triple.isOSBinFormatCOFF();