Simplify some users of DeclarationName::getNameKind. Fold getFETokenInfoAsVoid into its only caller.

llvm-svn: 157116
diff --git a/clang/lib/AST/DeclarationName.cpp b/clang/lib/AST/DeclarationName.cpp
index 9eadf32..28188d9 100644
--- a/clang/lib/AST/DeclarationName.cpp
+++ b/clang/lib/AST/DeclarationName.cpp
@@ -281,7 +281,7 @@
 void *DeclarationName::getFETokenInfoAsVoidSlow() const {
   switch (getNameKind()) {
   case Identifier:
-    llvm_unreachable("Handled by getFETokenInfoAsVoid()");
+    llvm_unreachable("Handled by getFETokenInfo()");
 
   case CXXConstructorName:
   case CXXDestructorName: