Revert "Also visit auxiliary declarations of top-level decls"

This reverts commit 17f5686.

Author: DougGregor

lib/SIL/IR/SILSymbolVisitor.cpp

@@ -395,13 +395,6 @@ class SILSymbolVisitorImpl : public ASTVisitor<SILSymbolVisitorImpl> {
       addMainIfNecessary(file);
 
       for (auto D : decls) {
-        D->visitAuxiliaryDecls([&](Decl *decl) {
-          if (Ctx.getOpts().LinkerDirectivesOnly && !requiresLinkerDirective(decl))
-            return;
-
-          visit(decl);
-        });
-
         if (Ctx.getOpts().LinkerDirectivesOnly && !requiresLinkerDirective(D))
           continue;