FIR checker: skip error named reference if receiver is unresolved

Currently, FIR reports errors caused by previous resolution failure. For
example with unresolved `a` and `b` in code `a.b`, both `a` and `b` are
highlighted. FE1.0 only highlights `a` since it's the root cause. This
change applies this heuristics when reporting FirDiagnostics.

compiler/tests-spec/testData/diagnostics/notLinked/dfa/neg/1.fir.kt

@@ -191,7 +191,7 @@ fun case_13(x: <!UNRESOLVED_REFERENCE!>otherpackage.Case13?<!>) =
 class Case14 {
     val x: <!UNRESOLVED_REFERENCE!>otherpackage.Case14?<!>
     init {
-        x = <!UNRESOLVED_REFERENCE!>otherpackage<!>.<!UNRESOLVED_REFERENCE!>Case14<!>()
+        x = <!UNRESOLVED_REFERENCE!>otherpackage<!>.Case14()
     }
 }