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/infos/SmartCasts.fir.kt

@@ -89,17 +89,17 @@ fun f13(a : A?) {
   }
   else {
     a?.foo()
-    <!UNRESOLVED_REFERENCE!>c<!>.<!UNRESOLVED_REFERENCE!>bar<!>()
+    <!UNRESOLVED_REFERENCE!>c<!>.bar()
   }
 
   a?.foo()
   if (!(a is B)) {
     a?.foo()
-    <!UNRESOLVED_REFERENCE!>c<!>.<!UNRESOLVED_REFERENCE!>bar<!>()
+    <!UNRESOLVED_REFERENCE!>c<!>.bar()
   }
   else {
     a.foo()
-    <!UNRESOLVED_REFERENCE!>c<!>.<!UNRESOLVED_REFERENCE!>bar<!>()
+    <!UNRESOLVED_REFERENCE!>c<!>.bar()
   }
 
   a?.foo()
@@ -109,7 +109,7 @@ fun f13(a : A?) {
   }
   else {
     a?.foo()
-    <!UNRESOLVED_REFERENCE!>c<!>.<!UNRESOLVED_REFERENCE!>bar<!>()
+    <!UNRESOLVED_REFERENCE!>c<!>.bar()
   }
 
   if (!(a is B) || !(a is C)) {