JVM_IR KT-47326 downcast field receiver on JvmField lowering

compiler/testData/codegen/box/jvmField/kt47328.kt

@@ -0,0 +1,17 @@
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+
+interface A { val x: Int }
+
+class B(@JvmField override val x: Int): A
+
+class C<D: A>(@JvmField val d: D)
+
+class E(c: C<B>) { val ax = c.d.x }
+
+fun box(): String {
+    val e = E(C(B(42)))
+    if (e.ax != 42)
+        return "Failed: ${e.ax}"
+    return "OK"
+}