Make Parser::getAccessSpecifierIfPresent const, since it does not modify the state

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@49629 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseDeclCXX.cpp b/lib/Parse/ParseDeclCXX.cpp
index 606ff57..04cd254 100644
--- a/lib/Parse/ParseDeclCXX.cpp
+++ b/lib/Parse/ParseDeclCXX.cpp
@@ -11,9 +11,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/Parse/Parser.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Parse/DeclSpec.h"
-#include "clang/Parse/Parser.h"
 #include "clang/Parse/Scope.h"
 using namespace clang;
 
@@ -339,7 +339,7 @@
 ///         'private'
 ///         'protected'
 ///         'public'
-AccessSpecifier Parser::getAccessSpecifierIfPresent()
+AccessSpecifier Parser::getAccessSpecifierIfPresent() const
 {
   switch (Tok.getKind()) {
   default: return AS_none;