The list of warnings below should NEVER grow. It should gradually shrink to 0.
-CHECK: Warnings without flags (305):
+CHECK: Warnings without flags (304):
CHECK-NEXT: backslash_newline_space
CHECK-NEXT: charize_microsoft_ext
CHECK-NEXT: ext_anon_param_requires_type_specifier
CHECK-NEXT: warn_drv_clang_unsupported
CHECK-NEXT: warn_drv_conflicting_deployment_targets
CHECK-NEXT: warn_drv_input_file_unused
-CHECK-NEXT: warn_drv_no_debug_w_integrated_as
CHECK-NEXT: warn_drv_not_using_clang_arch
CHECK-NEXT: warn_drv_not_using_clang_cpp
CHECK-NEXT: warn_drv_not_using_clang_cxx