Add ir interpreter tests

compiler/testData/ir/interpreter/innerClass.kt

@@ -0,0 +1,27 @@
+@CompileTimeCalculation
+class Outer {
+    private val bar: String = "bar"
+    val num = 1
+
+    fun foo() = "outer foo"
+
+    inner class Middle {
+        val num = 2
+
+        fun foo() = "middle foo"
+
+        inner class Inner {
+            val num = 3
+
+            fun foo() = "inner foo with outer bar = \"$bar\""
+
+            fun getAllNums() = "From inner: " + this.num + "; from middle: " + this@Middle.num + "; from outer: " + this@Outer.num
+        }
+    }
+}
+
+const val a1 = Outer().<!EVALUATED: `outer foo`!>foo()<!>
+const val a2 = Outer().Middle().<!EVALUATED: `middle foo`!>foo()<!>
+const val a3 = Outer().Middle().Inner().<!EVALUATED: `inner foo with outer bar = "bar"`!>foo()<!>
+
+const val b = Outer().Middle().Inner().<!EVALUATED: `From inner: 3; from middle: 2; from outer: 1`!>getAllNums()<!>