Support calling inline functions inside inline classes

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

@@ -0,0 +1,14 @@
+// !LANGUAGE: +InlineClasses
+
+inline class Foo(val a: String) {
+    fun test(): String {
+        return a + inlineFun()
+    }
+}
+
+inline fun inlineFun(): String = "K"
+
+fun box(): String {
+    val f = Foo("O")
+    return f.test()
+}