Apply modernize-use-default to clang.

Summary: Replace empty bodies of default constructors and destructors with '= default'.

Reviewers: bkramer, klimek

Subscribers: klimek, alexfh, cfe-commits

Differential Revision: http://reviews.llvm.org/D13890

llvm-svn: 250822
diff --git a/clang/lib/Frontend/SerializedDiagnosticPrinter.cpp b/clang/lib/Frontend/SerializedDiagnosticPrinter.cpp
index 1bf10d2..1cf886c 100644
--- a/clang/lib/Frontend/SerializedDiagnosticPrinter.cpp
+++ b/clang/lib/Frontend/SerializedDiagnosticPrinter.cpp
@@ -62,7 +62,7 @@
                  DiagnosticOptions *DiagOpts)
     : DiagnosticNoteRenderer(LangOpts, DiagOpts), Writer(Writer) {}
 
-  ~SDiagsRenderer() override {}
+  ~SDiagsRenderer() override = default;
 
 protected:
   void emitDiagnosticMessage(SourceLocation Loc,
@@ -159,7 +159,7 @@
     EmitPreamble();
   }
 
-  ~SDiagsWriter() override {}
+  ~SDiagsWriter() override = default;
 
   void HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
                         const Diagnostic &Info) override;