Add the first phi's input as possible generate-at-use-site.

frog/tests/leg/src/TypeInferenceTest.dart

 // Copyright (c) 2011, 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.
 
 #import("compiler_helper.dart");
 
 final String TEST_ONE = @"""
 sum(param0, param1) {
   var sum = 0;
   for (var i = param0; i < param1; i += 1) sum = sum + i;
@@ skipping 36 matching lines @@
 }
 """;
 
 main() {
   String generated = compile(TEST_ONE, 'sum');
   RegExp regexp = new RegExp("i = \\(?$anyIdentifier \\+ \\(1\\)\\)?");
   // TODO(ngeoffray): Do live range analysis to make this test pass.
   Expect.isFalse(regexp.hasMatch(generated));
 
   regexp = new RegExp("sum = \\(?$anyIdentifier \\+ $anyIdentifier\\)?");
-  // TODO(ngeoffray): Do live range analysis to make this test pass.
-  Expect.isFalse(regexp.hasMatch(generated));
+  Expect.isTrue(regexp.hasMatch(generated));
 
   regexp = const RegExp("typeof param0 !== 'number'");
   Expect.isTrue(regexp.hasMatch(generated));
 
   regexp = const RegExp("typeof param1 !== 'number'");
   Expect.isTrue(regexp.hasMatch(generated));
 
   generated = compile(TEST_TWO, 'foo');
   regexp = new RegExp(getNumberTypeCheck('param0'));
   Expect.isTrue(regexp.hasMatch(generated));
@@ skipping 14 matching lines @@
   Expect.isTrue(regexp.hasMatch(generated));
   Expect.isTrue(!generated.contains('index'));
   Expect.isTrue(!generated.contains('indexSet'));
 
   generated = compile(TEST_FIVE, 'foo');
   regexp = const RegExp('a.constructor !== Array');
   Expect.isTrue(regexp.hasMatch(generated));
   Expect.isTrue(!generated.contains('index'));
   Expect.isTrue(!generated.contains('indexSet'));
 }