Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/arrayConvention/simpleAccessWithDefaultInClass.kt

@@ -0,0 +1,36 @@
+// FILE: 1.kt
+
+package test
+
+var res = 1
+
+class A {
+
+    inline operator fun Int.get(z: Int, p: () -> Int, defaultt: Int = 100) = this + z + p() + defaultt
+
+    inline operator fun Int.set(z: Int, p: () -> Int, l: Int/*, x : Int = 1000*/) {
+        res = this + z + p() + l /*+ x*/
+    }
+}
+
+// FILE: 2.kt
+
+import test.*
+
+
+fun box(): String {
+
+    val z = 1;
+
+    with(A()) {
+
+        val p = z[2, { 3 }]
+        if (p != 106) return "fail 1: $p"
+
+        val captured = 3;
+        z[2, { captured }] = p
+        if (res != 112) return "fail 2: $res"
+    }
+
+    return "OK"
+}