Index: cfe/trunk/include/clang/Lex/MacroInfo.h
===================================================================
--- cfe/trunk/include/clang/Lex/MacroInfo.h
+++ cfe/trunk/include/clang/Lex/MacroInfo.h
@@ -395,7 +395,8 @@
 
   /// Find macro definition active in the specified source location. If
   /// this macro was not defined there, return NULL.
-  const DefInfo findDirectiveAtLoc(SourceLocation L, SourceManager &SM) const;
+  const DefInfo findDirectiveAtLoc(SourceLocation L,
+                                   const SourceManager &SM) const;
 
   void dump() const;
 
Index: cfe/trunk/lib/Lex/MacroInfo.cpp
===================================================================
--- cfe/trunk/lib/Lex/MacroInfo.cpp
+++ cfe/trunk/lib/Lex/MacroInfo.cpp
@@ -200,7 +200,8 @@
 }
 
 const MacroDirective::DefInfo
-MacroDirective::findDirectiveAtLoc(SourceLocation L, SourceManager &SM) const {
+MacroDirective::findDirectiveAtLoc(SourceLocation L,
+                                   const SourceManager &SM) const {
   assert(L.isValid() && "SourceLocation is invalid.");
   for (DefInfo Def = getDefinition(); Def; Def = Def.getPreviousDefinition()) {
     if (Def.getLocation().isInvalid() ||  // For macros defined on the command line.