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/testData/diagnostics/tests/objects/ObjectsLocal.fir.kt

@@ -22,4 +22,4 @@ fun test() {
     B.foo()
 }
 
-val bb = <!UNRESOLVED_REFERENCE!>B<!>.<!UNRESOLVED_REFERENCE!>foo<!>()
+val bb = <!UNRESOLVED_REFERENCE!>B<!>.foo()