Fix generation of checkcast instructions for inline classes

Normalize LHS and RHS types to use only boxed ones and then let bytecode
 optmizer reduce redundant boxing

compiler/testData/codegen/bytecodeText/inlineClasses/noBoxingOnCastOperations.kt

@@ -0,0 +1,30 @@
+// !LANGUAGE: +InlineClasses
+
+// FILE: util.kt
+
+inline class AsAny<T>(val x: Any?)
+inline class AsInt(val x: Int)
+
+// FILE: Reference.kt
+
+fun <T, R> transform(a: AsAny<T>): AsAny<R> = a as AsAny<R>
+fun <T, R> transformNullable(a: AsAny<T>?): AsAny<R> = a as AsAny<R> // unbox
+fun <T, R> transformToNullable(a: AsAny<T>): AsAny<R>? = a as AsAny<R> // box
+fun <T, R> transformToNullableTarget(a: AsAny<T>): AsAny<R>? = a as AsAny<R>? // box
+fun <T, R> transformNullableToNullableTarget(a: AsAny<T>?): AsAny<R>? = a as AsAny<R>?
+
+// FILE: Primitive.kt
+
+fun transform(a: AsInt): AsInt = a as AsInt
+fun transformNullable(a: AsInt?): AsInt = a as AsInt // unbox
+fun transformToNullable(a: AsInt): AsInt? = a as AsInt // box
+fun transformToNullableTarget(a: AsInt): AsInt? = a as AsInt? // box
+fun transformNullableToNullableTarget(a: AsInt?): AsInt? = a as AsInt?
+
+// @ReferenceKt.class:
+// 2 INVOKESTATIC AsAny\$Erased.box
+// 1 INVOKEVIRTUAL AsAny.unbox
+
+// @PrimitiveKt.class:
+// 2 INVOKESTATIC AsInt\$Erased.box
+// 1 INVOKEVIRTUAL AsInt.unbox