Fix JVM import caching and class/object bytecode dispatch

examples/fillspeed.lyng

@@ -0,0 +1,15 @@
+import lyng.time
+
+val n = 700_000
+
+fun tm<T>(block: ()->T): T {
+    val t = Instant()
+    block().also {
+        println("tm: ${Instant() - t}")
+    }
+}
+
+val x = tm { List.fill(n) { it * 10 + 1 } }
+val y = tm { List.fill(n, n + 10) { it * 10 + 1 } }
+tm { x.add(-1) }
+tm { y.add(-2) }