Integrate new result macros. (#1780)

* result: try out some experimental shenanigans

* result: sketch out some more shenanigans

* result: see what it looks like to convert kernel to use result conds instead of guards

* make rest of kernel use experimental new macro-ing

libraries/libmesosphere/source/arch/arm64/kern_k_thread_context.cpp

@@ -150,12 +150,12 @@ namespace ams::kern::arch::arm64 {
         /* Lock the context, if we're a main thread. */
         m_locked = is_main;
 
-        return ResultSuccess();
+        R_SUCCEED();
     }
 
     Result KThreadContext::Finalize() {
         /* This doesn't actually do anything. */
-        return ResultSuccess();
+        R_SUCCEED();
     }
 
     void KThreadContext::SetArguments(uintptr_t arg0, uintptr_t arg1) {