Constify ASTLocation::print.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77532 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Index/ASTLocation.cpp b/lib/Index/ASTLocation.cpp
index 55a90fa..d528c5a 100644
--- a/lib/Index/ASTLocation.cpp
+++ b/lib/Index/ASTLocation.cpp
@@ -117,14 +117,14 @@
   return isDecl() ? getDecl()->getSourceRange() : getStmt()->getSourceRange();
 }
 
-void ASTLocation::print(llvm::raw_ostream &OS) {
+void ASTLocation::print(llvm::raw_ostream &OS) const {
   if (isInvalid()) {
     OS << "<< Invalid ASTLocation >>\n";
     return;
   }
 
   OS << "[Decl: " << getDecl()->getDeclKindName() << " ";
-  if (NamedDecl *ND = dyn_cast<NamedDecl>(getDecl()))
+  if (const NamedDecl *ND = dyn_cast<NamedDecl>(getDecl()))
     OS << ND->getNameAsString();
   
   if (getStmt()) {