Add a warning to a group

Add warn_drv_object_size_disabled_O0 to the invalid command line
argument group. This should fix some bot failures:

  lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-ubuntu-fast/builds/13241/steps/test/logs/stdio

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@306183 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 283ac36731893129f189c580dbe2b4b1f6e87241)
diff --git a/include/clang/Basic/DiagnosticDriverKinds.td b/include/clang/Basic/DiagnosticDriverKinds.td
index 837da16..a99bcc8 100644
--- a/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/include/clang/Basic/DiagnosticDriverKinds.td
@@ -224,7 +224,8 @@
   "implicitly disabling vptr sanitizer because rtti wasn't enabled">,
   InGroup<DiagGroup<"auto-disable-vptr-sanitizer">>;
 def warn_drv_object_size_disabled_O0 : Warning<
-  "the object size sanitizer has no effect at -O0, but is explicitly enabled: %0">;
+  "the object size sanitizer has no effect at -O0, but is explicitly enabled: %0">,
+  InGroup<InvalidCommandLineArgument>;
 
 def note_drv_command_failed_diag_msg : Note<
   "diagnostic msg: %0">;