Revert "Maybe add new warning for shadowing simple tag types"

This reverts commit 2b43f500cfea10a8c59c986dcfc24fd08eecc77d.

This was accidentally committed because I failed to notice my client
wasn't clean prior to submitting a fix for a crasher.

llvm-svn: 197410

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -3662,10 +3662,6 @@ def err_redefinition_different_type : Error<
   "redefinition of %0 with a different type%diff{: $ vs $|}1,2">;
 def err_redefinition_different_kind : Error<
   "redefinition of %0 as different kind of symbol">;
-def warn_declaration_shadows_tag_type : Warning<
-  "declaration of %0 shadows %1 %0; '%1' tag will be needed to refer to the %1">,
-  InGroup<Shadow>, DefaultIgnore;
-def note_shadowed_tag_type_declaration : Note<"%1 %0 declared here">;
 def warn_forward_class_redefinition : Warning<
   "redefinition of forward class %0 of a typedef name of an object type is ignored">,
   InGroup<DiagGroup<"objc-forward-class-redefinition">>;

clang/lib/Sema/SemaDecl.cpp

@@ -4398,14 +4398,8 @@ NamedDecl *Sema::HandleDeclarator(Scope *S, Declarator &D,
   // tag type. Note that this does does not apply if we're declaring a
   // typedef (C++ [dcl.typedef]p4).
   if (Previous.isSingleTagDecl() &&
-      D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) {
-    TagDecl *TD = Previous.getAsSingle<TagDecl>();
-    Diag(D.getIdentifierLoc(), diag::warn_declaration_shadows_tag_type)
-        << Name << TD->getKindName();
-    Diag(TD->getLocation(), diag::note_shadowed_tag_type_declaration)
-        << Name << TD->getKindName();
+      D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
     Previous.clear();
-  }
 
   // Check that there are no default arguments other than in the parameters
   // of a function declaration (C++ only).