Rename -Wunused-method -> -Wunused-member-function.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111305 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index 92e3fdd..03feed0 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -377,7 +377,7 @@
       if (!FD->hasBody(DiagD))
         DiagD = FD;
       Diag(DiagD->getLocation(),
-           isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_method
+           isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
                                      : diag::warn_unused_function)
             << DiagD->getDeclName();
     } else {