cpsir unittests: move all unittests into individual files and test runners.

tests/compiler/dart2js/js_backend_cps_ir_gvn_test.dart

-// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// Test that the GVN optimization pass works as expected.
-
-library gvn_tests;
-
-import 'js_backend_cps_ir.dart';
-
-const List<TestEntry> tests = const [
-  const TestEntry(r"""
-foo(x, list) {
-  var sum = 0;
-  for (int k = 0; k < 10; k++) {
-    // Everything can be hoisted out up to the index access which is
-    // blocked by the bounds check.
-    var a = x.left.left;
-    var b = x.left.right;
-    var c = x.right.left;
-    var d = x.right.right;
-    var i = a.value + c.value;
-    var j = b.value + d.value;
-    var z = list[i * j] + i;
-    sum += z;
-  }
-  return sum;
-}
-// Use a different class for each level in the tree, so type inference
-// is not confused.
-class Root {
-  Branch left, right;
-  Root(this.left, this.right);
-}
-class Branch {
-  Leaf left, right;
-  Branch(this.left, this.right);
-}
-class Leaf {
-  int value;
-  Leaf(this.value);
-}
-main() {
-  var x1 = new Leaf(1);
-  var x2 = new Leaf(10);
-  var x3 = new Leaf(20);
-  var x4 = new Leaf(-10);
-  var y1 = new Branch(x1, x2);
-  var y2 = new Branch(x3, x4);
-  var z  = new Root(y1, y2);
-  print(foo(z, [1,2,3,4,5,6,7,8,9,10]));
-}
-""",r"""
-function() {
-  var v0 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], sum = 0, k = 0, i, v1;
-  for (; k < 10; sum += i + v0[v1], ++k) {
-    i = 1 + 20;
-    v1 = i * (10 + -10);
-    if (v1 < 0 || v1 >= 10)
-      return H.ioore(v0, v1);
-  }
-  v0 = H.S(sum);
-  if (typeof dartPrint == "function")
-    dartPrint(v0);
-  else if (typeof console == "object" && typeof console.log != "undefined")
-    console.log(v0);
-  else if (!(typeof window == "object")) {
-    if (!(typeof print == "function"))
-      throw "Unable to print message: " + String(v0);
-    print(v0);
-  }
-}"""),
-];
-
-void main() {
-  runTests(tests);
-}