C++: Fix parsing designators vs lambdas

The introduction of C99 designators led to parsing problems with lambdas
that were passed in as a function arguments.

Fixed by prefering to parse without designators first. This will be
cleaner/clearer once the appropriate "LanguageFeatures" from the Project
Parts will be passed in.

Change-Id: Ia9cb7c4a4c9345e729cf2044e1e5411fe63e33ec
Reviewed-by: Wang Hoi <wanghoi@126.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

tests/auto/cplusplus/cxx11/data/lambda.1.cpp

@@ -0,0 +1 @@
+Foo foo([&](int a) { ++a; });