Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/reified/checkCast/simpleSafe.kt

@@ -0,0 +1,56 @@
+// FILE: 1.kt
+
+package test
+
+class A
+class B
+
+inline fun <reified T> Any?.foo(): T? = this as? T
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    if (null.foo<Any>() != null) return "failTypeCast 1"
+    if (null.foo<Any?>() != null) return "failTypeCast 2"
+
+    if  (null.foo<A>() != null) return "failTypeCast 3"
+    if  (null.foo<A?>() != null) return "failTypeCast 4"
+
+    val a = A()
+
+    if (a.foo<Any>() != a) return "failTypeCast 5"
+    if (a.foo<Any?>() != a) return "failTypeCast 6"
+
+    if (a.foo<A>() != a) return "failTypeCast 7"
+    if (a.foo<A?>() != a) return "failTypeCast 8"
+
+    val b = B()
+
+    if (b.foo<A>() != null) return "fail 9"
+    if (b.foo<A?>() != null) return "fail 10"
+
+    return "OK"
+}
+
+inline fun failTypeCast(s: () -> Unit) {
+    try {
+        s()
+    }
+    catch (e: TypeCastException) {
+
+    }
+}
+
+inline fun failClassCast(s: () -> Unit) {
+    try {
+        s()
+    }
+    catch (e: TypeCastException) {
+        throw e
+    }
+    catch (e: ClassCastException) {
+
+    }
+}