[FIR] Handle fully qualified expressions separately in tower resolver

compiler/testData/diagnostics/tests/controlStructures/kt770.fir.kt351.fir.kt735_StatementType.fir.kt

@@ -140,7 +140,7 @@ fun testCoercionToAny() {
 fun fooWithAnuNullableResult(s: String?, name: String, optional: Boolean): Any? {
     return if (s == null) {
         if (!optional) {
-            throw java.lang.<!UNRESOLVED_REFERENCE!>IllegalArgumentException<!>("Parameter '$name' was not found in the request")
+            throw java.lang.IllegalArgumentException("Parameter '$name' was not found in the request")
         }
         null
     } else {