tests added

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

@@ -0,0 +1,28 @@
+fun returningBoxed() : Int? = 1
+fun acceptingBoxed(x : Int?) : Int ? = x
+
+class A(var x : Int? = null)
+
+fun foo() {
+    val rb = returningBoxed()
+    acceptingBoxed(2)
+
+    val a = A()
+    a.x = 3
+
+    val b = Array<Int?>(4, { null })
+    b[100] = 5
+
+    val x = 6 : Int?
+    val hc = x!!.hashCode()
+
+    val y = 7 : Int?
+    val z = 8 : Int?
+    val res = y.identityEquals(z)
+
+    val c1: Any = if (1 == 1) 0 else "abc"
+    val c2: Any = if (1 != 1) 0 else "abc"
+}
+
+// 10 java/lang/Integer.valueOf
+// 1 intValue