Check in codegen test expectations.

test/codegen/expect/language/phi_merge_test.js

Index: test/codegen/expect/language/phi_merge_test.js
diff --git a/test/codegen/expect/language/phi_merge_test.js b/test/codegen/expect/language/phi_merge_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..c7b59e925f7f85bdce8f3da5ca860f87b196454c
--- /dev/null
+++ b/test/codegen/expect/language/phi_merge_test.js
@@ -0,0 +1,41 @@
+dart_library.library('language/phi_merge_test', null, /* Imports */[
+  'dart_sdk'
+], function load__phi_merge_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const phi_merge_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  phi_merge_test.A = class A extends core.Object {
+    set(index, value) {
+      switch (value) {
+        case 42:
+        {
+          break;
+        }
+        case 43:
+        {
+          break;
+        }
+      }
+      return value;
+    }
+  };
+  dart.setSignature(phi_merge_test.A, {
+    methods: () => ({set: dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dart.dynamic])})
+  });
+  phi_merge_test.main = function() {
+    let a = null;
+    if (true) {
+      a = new phi_merge_test.A();
+    } else {
+      a = new phi_merge_test.A();
+    }
+    dart.dsetindex(a, 0, 42);
+    core.print(a);
+  };
+  dart.fn(phi_merge_test.main, VoidTodynamic());
+  // Exports:
+  exports.phi_merge_test = phi_merge_test;
+});