reuse the warn_deprecated text

Author: zmodem

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -6009,7 +6009,7 @@ def note_not_found_by_two_phase_lookup : Note<"%0 should be declared prior to th
 def err_undeclared_use : Error<"use of undeclared %0">;
 def warn_deprecated : Warning<"%0 is deprecated">,
     InGroup<DeprecatedDeclarations>;
-def warn_deprecated_switch_case : Warning<"%0 is deprecated">,
+def warn_deprecated_switch_case : Warning<warn_deprecated.Summary>,
     InGroup<DeprecatedSwitchCase>;
 def note_from_diagnose_if : Note<"from 'diagnose_if' attribute on %0:">;
 def warn_property_method_deprecated :