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/imports/ClassClashStarImport.fir.kt

@@ -71,6 +71,6 @@ fun test(b: B) {
     val b_3 = B()
     b_3.m2()
 
-    val b_4 = <!UNRESOLVED_REFERENCE!>a<!>.<!UNRESOLVED_REFERENCE!>B<!>()
+    val b_4 = <!UNRESOLVED_REFERENCE!>a<!>.B()
     b_4.<!UNRESOLVED_REFERENCE!>m2<!>()
 }