Concurrency: Fix incorrect isLocalContext() check

Author: slavapestov

lib/Sema/TypeCheckConcurrency.cpp

@@ -2633,7 +2633,7 @@ namespace {
       }
 
       if (auto func = dyn_cast<AbstractFunctionDecl>(decl)) {
-        if (func->isLocalContext()) {
+        if (func->getDeclContext()->isLocalContext()) {
           checkLocalCaptures(func);
         }