[AST] Print fixed enum type regardless of language mode

These are permitted in all language modes, not just C++11.

Author: epilk

clang/lib/AST/DeclPrinter.cpp

@@ -532,7 +532,7 @@ void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
 
   Out << ' ' << *D;
 
-  if (D->isFixed() && D->getASTContext().getLangOpts().CPlusPlus11)
+  if (D->isFixed())
     Out << " : " << D->getIntegerType().stream(Policy);
 
   if (D->isCompleteDefinition()) {

clang/test/AST/ast-print-enum-decl.c

@@ -103,3 +103,8 @@ struct DeclGroupInMemberList {
   enum T2 { T20 } *p1, *p2;
   // PRINT-NEXT: };
 };
+
+enum fixedEnum : int { fixedEnumerator };
+// PRINT-LABEL: enum fixedEnum : int {
+// PRINT-NEXT: fixedEnumerator
+// PRINT-NEXT: };