Enable default @synthesize by default.

llvm-svn: 152140
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index aee2174..e894105 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -349,7 +349,7 @@
   }
   
   virtual bool IsObjCDefaultSynthPropertiesDefault() const {
-    return false;
+    return true;
   }
 
   virtual bool IsObjCNonFragileABIDefault() const {