Fix this remapping in inner class constructors

Inner class constructors should use the argument instead of reading
outer `this` from a field because if such an access happens before a
delegating constructor call, e.g. when evaluating an argument, a JVM
bytecode validation error will be thrown. (The only operation on `this`
allowed before a delegating constructor call is SETFIELD, and only if
the field in question is declared in the same class.)

compiler/testData/codegen/box/closures/captureInSuperConstructorCall/kt14148.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 interface Test {
     fun test(): String
 }
@@ -15,4 +14,4 @@ open class Outer(val x: String) {
     )
 }
 
-fun box() = Outer("OK").JavacBug().test.test()
+fun box() = Outer("OK").JavacBug().test.test()