SI-8841 report named arg / assignment ambiguity also in silent mode.

For local definitions (eg. in a block that is an argument of a method
call), the type completer may have a silent context. A CyclicReference
is then not thrown but transformed into a NormalTypeError. When
deciding if 'x = e' is an assignment or a named arg, we need to report
cyclic references, but not other type errors. In the above case, the
cyclic reference was not reported.

Also makes sure that warnings are printed after typing argument
expressions.