Revert r158700 and dependent patches r158716, r158717, and r158731.

The original r158700 caused crashes in the gcc test suite,
g++.abi/vtable3a.C among others. It also caused failures in the libc++
test suite.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158749 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseDeclCXX.cpp b/lib/Parse/ParseDeclCXX.cpp
index 6e391c9..b906292 100644
--- a/lib/Parse/ParseDeclCXX.cpp
+++ b/lib/Parse/ParseDeclCXX.cpp
@@ -2902,11 +2902,11 @@
     switch (AttributeList::getKind(AttrName, ScopeName,
                                    AttributeList::AS_CXX11)) {
     // No arguments
-    case AttributeList::AT_CarriesDependency:
+    case AttributeList::AT_carries_dependency:
     // FIXME: implement generic support of attributes with C++11 syntax
     // see Parse/ParseDecl.cpp: ParseGNUAttributes
-    case AttributeList::AT_FallThrough:
-    case AttributeList::AT_NoReturn: {
+    case AttributeList::AT_fallthrough:
+    case AttributeList::AT_noreturn: {
       if (Tok.is(tok::l_paren)) {
         Diag(Tok.getLocation(), diag::err_cxx11_attribute_forbids_arguments)
           << AttrName->getName();