KT-27705: Use proper types for captured outer class instance

Call typeMapper only if we have an inline class.

compiler/testData/codegen/box/inlineClasses/kt27705.kt

@@ -0,0 +1,17 @@
+// !LANGUAGE: +InlineClasses
+// WITH_RUNTIME
+// IGNORE_BACKEND: JVM_IR
+
+inline class Z(val x: Int) {
+    inner class Inner(val y: Int) {
+        val xx = x
+    }
+}
+
+fun box(): String {
+    val zi = Z(42).Inner(100)
+    if (zi.xx != 42) throw AssertionError()
+    if (zi.y != 100) throw AssertionError()
+
+    return "OK"
+}