Rename Diagnostic to DiagnosticsEngine as per issue 5397


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140478 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ARCMigrate/TransformActions.cpp b/lib/ARCMigrate/TransformActions.cpp
index 1321686..ec676e9 100644
--- a/lib/ARCMigrate/TransformActions.cpp
+++ b/lib/ARCMigrate/TransformActions.cpp
@@ -595,7 +595,7 @@
 
 TransformActions::RewriteReceiver::~RewriteReceiver() { }
 
-TransformActions::TransformActions(Diagnostic &diag,
+TransformActions::TransformActions(DiagnosticsEngine &diag,
                                    CapturedDiagList &capturedDiags,
                                    ASTContext &ctx, Preprocessor &PP)
   : Diags(diag), CapturedDiags(capturedDiags), ReportedErrors(false) {