Check in codegen test expectations.

test/codegen/expect/language/compile_time_constant_p_test_none_multi.js

+dart_library.library('language/compile_time_constant_p_test_none_multi', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__compile_time_constant_p_test_none_multi(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const compile_time_constant_p_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  compile_time_constant_p_test_none_multi.A = class A extends core.Object {
+    new() {
+      this.x = null;
+    }
+  };
+  dart.setSignature(compile_time_constant_p_test_none_multi.A, {
+    constructors: () => ({new: dart.definiteFunctionType(compile_time_constant_p_test_none_multi.A, [])})
+  });
+  compile_time_constant_p_test_none_multi.B = class B extends compile_time_constant_p_test_none_multi.A {
+    new() {
+      super.new();
+    }
+  };
+  dart.setSignature(compile_time_constant_p_test_none_multi.B, {
+    constructors: () => ({new: dart.definiteFunctionType(compile_time_constant_p_test_none_multi.B, [])})
+  });
+  compile_time_constant_p_test_none_multi.b = dart.const(new compile_time_constant_p_test_none_multi.B());
+  compile_time_constant_p_test_none_multi.main = function() {
+    expect$.Expect.equals(null, compile_time_constant_p_test_none_multi.b.x);
+  };
+  dart.fn(compile_time_constant_p_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.compile_time_constant_p_test_none_multi = compile_time_constant_p_test_none_multi;
+});