Replace -fobjc-default-synthesize-properties with disable-objc-default-synthesize-properties.

We want the modern behavior most of the time, so inverting the option simplifies
the driver and the tests.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191551 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index 2860641..d4122b2 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -418,7 +418,7 @@
   HelpText<"The target Objective-C runtime supports ARC weak operations">;
 def fobjc_dispatch_method_EQ : Joined<["-"], "fobjc-dispatch-method=">,
   HelpText<"Objective-C dispatch method to use">;
-def fobjc_default_synthesize_properties : Flag<["-"], "fobjc-default-synthesize-properties">,
+def disable_objc_default_synthesize_properties : Flag<["-"], "disable-objc-default-synthesize-properties">,
   HelpText<"enable the default synthesis of Objective-C properties">;
 def fencode_extended_block_signature : Flag<["-"], "fencode-extended-block-signature">,
   HelpText<"enable extended encoding of block type signature">;