K2: don't count use-sites of Java type parameter with nullable bounds as not null

compiler/testData/ir/irText/firProblems/SignatureComputationComplexJavaGeneric.fir.kt.txt

@@ -0,0 +1,46 @@
+class Inv<T : Any?> {
+  val x: T
+    field = x
+    get
+
+  constructor(x: T) /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+}
+
+class Test_1<TT : Any?> : JavaClass1<TT> {
+  val x: TT
+    field = x
+    get
+
+  constructor(x: TT) /* primary */ {
+    super/*JavaClass1*/<TT>()
+    /* <init>() */
+
+  }
+
+  fun test(b: B<TT>) {
+    b.output(x = <this>.<get-x>())
+  }
+
+}
+
+class Test_2<TT : Any?> : JavaClass2<TT, Inv<TT>> {
+  constructor() /* primary */ {
+    super/*JavaClass2*/<TT, Inv<TT>>()
+    /* <init>() */
+
+  }
+
+  fun process(b: B<TT, Inv<TT>>) {
+    b.output(output = Inv<TT>(x = b.element()))
+  }
+
+}
+
+fun <R : Any?> test_3(jb: B<R>, r: R) {
+  jb.output(x = r)
+}