Minor. Move tests

compiler/testData/codegen/box/specialBuiltins/maps.kt

@@ -0,0 +1,41 @@
+class A : Map<String, String> {
+    override val size: Int get() = 56
+
+    override fun isEmpty(): Boolean {
+        throw UnsupportedOperationException()
+    }
+
+    override fun containsKey(key: String): Boolean {
+        throw UnsupportedOperationException()
+    }
+
+    override fun containsValue(value: String): Boolean {
+        throw UnsupportedOperationException()
+    }
+
+    override fun get(key: String): String? {
+        throw UnsupportedOperationException()
+    }
+
+    override val keys: Set<String> get() {
+        throw UnsupportedOperationException()
+    }
+
+    override val values: Collection<String> get() {
+        throw UnsupportedOperationException()
+    }
+
+    override val entries: Set<Map.Entry<String, String>> get() {
+        throw UnsupportedOperationException()
+    }
+}
+
+fun box(): String {
+    val a = A()
+    if (a.size != 56) return "fail 1: ${a.size}"
+
+    val x: Map<String, String> = a
+    if (x.size != 56) return "fail 2: ${x.size}"
+
+    return "OK"
+}