Tests for issues fixed in JVM_IR

compiler/testData/codegen/bytecodeListing/sam/kt16650.kt

@@ -0,0 +1,16 @@
+// WITH_SIGNATURES
+// FILE: t.kt
+fun main(x: DataStream<Int>) {
+    x.keyBy({ it.toLong() })
+    x.keyBy(KeySelector<Int, Long>{ it.toLong() })
+}
+
+// FILE: KeySelector.java
+public interface KeySelector<IN, KEY> {
+    KEY getKey(IN value);
+}
+
+// FILE: DataStream.java
+public class DataStream<T> {
+    public <K> void keyBy(KeySelector<T,K> key) {}
+}