Remove code associated with the old "kompile" functionality.

pkg/front_end/testcases/inference/assign_local.dart.dartk.expect

-library test;
-import self as self;
-import "dart:core" as core;
-
-class A<T extends core::Object> extends core::Object {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-}
-class B<T extends core::Object> extends self::A<self::B::T> {
-  constructor •() → void
-    : super self::A::•()
-    ;
-}
-static method main() → dynamic {
-  core::num x;
-  dynamic x1 = x = 1;
-  dynamic x2 = x = 1.0;
-}