Revert r171048, "Cache visibility of decls."

It broke stage2.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171050 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaAttr.cpp b/lib/Sema/SemaAttr.cpp
index 3bfb8f2..4406f2d 100644
--- a/lib/Sema/SemaAttr.cpp
+++ b/lib/Sema/SemaAttr.cpp
@@ -309,8 +309,7 @@
   if (!VisContext)
     return;
 
-  NamedDecl *ND = dyn_cast<NamedDecl>(D);
-  if (ND && ND->getExplicitVisibility())
+  if (isa<NamedDecl>(D) && cast<NamedDecl>(D)->getExplicitVisibility())
     return;
 
   VisStack *Stack = static_cast<VisStack*>(VisContext);
@@ -321,7 +320,6 @@
     = (VisibilityAttr::VisibilityType) rawType;
   SourceLocation loc = Stack->back().second;
 
-  ND->ClearLVCache();
   D->addAttr(::new (Context) VisibilityAttr(loc, Context, type));
 }
 
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index e1d772b..105ef49 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -1775,13 +1775,9 @@
                                     AA->getIntroduced(), AA->getDeprecated(),
                                     AA->getObsoleted(), AA->getUnavailable(),
                                     AA->getMessage());
-  else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) {
+  else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr))
     NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility());
-    if (NewAttr) {
-      NamedDecl *ND = cast<NamedDecl>(D);
-      ND->ClearLVCache();
-    }
-  } else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr))
+  else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr))
     NewAttr = mergeDLLImportAttr(D, ImportA->getRange());
   else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr))
     NewAttr = mergeDLLExportAttr(D, ExportA->getRange());
@@ -6615,7 +6611,7 @@
     }
     VDecl->setTypeSourceInfo(DeducedType);
     VDecl->setType(DeducedType->getType());
-    VDecl->ClearLVCache();
+    VDecl->ClearLinkageCache();
     
     // In ARC, infer lifetime.
     if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index 437e2a8..22aad16 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -2147,11 +2147,8 @@
                                                       Deprecated.Version,
                                                       Obsoleted.Version,
                                                       IsUnavailable, Str);
-  if (NewAttr) {
+  if (NewAttr)
     D->addAttr(NewAttr);
-    NamedDecl *ND = cast<NamedDecl>(D);
-    ND->ClearLVCache();
-  }
 }
 
 VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range,
@@ -2168,8 +2165,6 @@
     Diag(ExistingAttr->getLocation(), diag::err_mismatched_visibility);
     Diag(Range.getBegin(), diag::note_previous_attribute);
     D->dropAttr<VisibilityAttr>();
-    NamedDecl *ND = cast<NamedDecl>(D);
-    ND->ClearLVCache();
   }
   return ::new (Context) VisibilityAttr(Range, Context, Vis);
 }
@@ -2213,11 +2208,8 @@
   }
 
   VisibilityAttr *NewAttr = S.mergeVisibilityAttr(D, Attr.getRange(), type);
-  if (NewAttr) {
+  if (NewAttr)
     D->addAttr(NewAttr);
-    NamedDecl *ND = cast<NamedDecl>(D);
-    ND->ClearLVCache();
-  }
 }
 
 static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl,