For C++ overloaded operator calls, set the source location of the DeclRefExpr to the location of the operator.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@75600 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index 4021e54..b7f698e 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -4209,7 +4209,7 @@
 
         // Build the actual expression node.
         Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(),
-                                                 SourceLocation());
+                                                 OpLoc);
         UsualUnaryConversions(FnExpr);
 
         return Owned(new (Context) CXXOperatorCallExpr(Context, Op, FnExpr,