Fix unboxing values of inline class type from type parameters

compiler/testData/codegen/box/inlineClasses/checkUnboxingResultFromTypeVariable.kt

@@ -0,0 +1,23 @@
+// !LANGUAGE: +InlineClasses
+
+inline class Result<T>(val a: Any?) {
+    fun typed(): T = a as T
+}
+
+fun box(): String {
+    val asInt = Result<Int>(19)
+    val asString = Result<String>("sample")
+    val asResult = Result<Result<Int>>(asInt)
+
+    val unboxedInt = asInt.typed()
+    val unboxedString = asString.typed()
+    val unboxedResult = asResult.typed()
+
+    if (unboxedInt != 19) return "fail"
+    if (unboxedString != "sample") return "fail"
+    if (unboxedResult.typed() != 19) return "fail"
+
+    if (asResult.typed().typed() != 19) return "fail"
+
+    return "OK"
+}