add a missing const qualifier for consistency.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126742 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 1 deletions

diff --git a/include/llvm/Support/SourceMgr.h b/include/llvm/Support/SourceMgr.h
index a41a633ba6..26a92bea76 100644
--- a/include/llvm/Support/SourceMgr.h
+++ b/include/llvm/Support/SourceMgr.h
@@ -171,7 +171,7 @@ public:
 
   const SourceMgr *getSourceMgr() const { return SM; }
   SMLoc getLoc() const { return Loc; }
-  const std::string &getFilename() { return Filename; }
+  const std::string &getFilename() const { return Filename; }
   int getLineNo() const { return LineNo; }
   int getColumnNo() const { return ColumnNo; }
   const std::string &getMessage() const { return Message; }