Replace dart_core.js with actual compiled SDK

test/codegen/expect/methods.js

Index: test/codegen/expect/methods.js
diff --git a/test/codegen/expect/methods.js b/test/codegen/expect/methods.js
index 12d271c404e688008cdc953fa59417319e90c9a8..ea96ac0df6e3de04c1b2952e3e4a07c829e5cc68 100644
--- a/test/codegen/expect/methods.js
+++ b/test/codegen/expect/methods.js
@@ -23,11 +23,11 @@ var methods;
       return b;
     }
     w(a, opt$) {
-      let b = opt$.b === void 0 ? null : opt$.b;
+      let b = opt$ && 'b' in opt$ ? opt$.b : null;
       return dart.notNull(a) + dart.notNull(b);
     }
     ww(a, opt$) {
-      let b = opt$.b === void 0 ? 0 : opt$.b;
+      let b = opt$ && 'b' in opt$ ? opt$.b : 0;
       return dart.notNull(a) + dart.notNull(b);
     }
     get a() {