tests added

compiler/testData/codegen/bytecodeText/boxingOptimization/checkcastAndInstanceOf.kt

@@ -0,0 +1,23 @@
+
+inline fun <R, T> foo(x : R, y : R, block : (R) -> T) : T {
+    val a = x is Number
+    val b = x is Object
+
+    val a1 = x as Number
+    val b1 = x as Object
+
+    if (a && b) {
+        return block(x)
+    } else {
+        return block(y)
+    }
+}
+
+fun bar() {
+    foo(1, 2) { x -> x is Int }
+}
+
+// 0 valueOf
+// 0 Value\s\(\)
+// 2 INSTANCEOF
+// 2 CHECKCAST