Revert "[InterfacePrinting] Print stdlib internal protocols whose names start with no '_'"

This reverts commit ca7c1e5692bdd51cb0800be42c964462a3c84436.

Swift SVN r30191

lib/IDE/ModuleInterfacePrinting.cpp

@@ -141,8 +141,6 @@ void swift::ide::printSubmoduleInterface(
        const PrintOptions &Options) {
   auto AdjustedOptions = Options;
   adjustPrintOptions(AdjustedOptions);
-  auto PrintInternalProtocol = Options.PrintInternalStdlibProtocols &&
-                               M->isStdlibModule();
 
   SmallVector<Decl *, 1> Decls;
   M->getDisplayDecls(Decls);
@@ -210,10 +208,6 @@ void swift::ide::printSubmoduleInterface(
     if (Options.SkipUnavailable && D->getAttrs().isUnavailable(SwiftContext))
       continue;
 
-    if (PrintInternalProtocol && ASTPrinter::isInternalProtocol(D)) {
-      SwiftDecls.push_back(D);
-    }
-
     // Skip declarations that are not accessible.
     if (auto *VD = dyn_cast<ValueDecl>(D)) {
       if (Options.AccessibilityFilter > Accessibility::Private &&