Fix instances where a loop 'always' exits, but also breaks, so it doesn't really exit.

pkg/analyzer/test/generated/all_the_rest_test.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.test.generated.all_the_rest_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 3886 matching lines @@
   }
 
   void test_whileStatement_true_return() {
     _assertTrue("{ while (true) { return null; } }");
   }
 
   void test_whileStatement_true_throw() {
     _assertTrue("{ while (true) { throw ''; } }");
   }
 
+  void test_whileStatement_true_break_and_throw() {
+    _assertFalse("{ while (true) { if (1==1) break; throw 'T'; } }");
+  }
+
   void _assertFalse(String source) {
     _assertHasReturn(false, source);
   }
 
   void _assertHasReturn(bool expectedResult, String source) {
     Statement statement = ParserTestCase.parseStatement(source);
     expect(ExitDetector.exits(statement), expectedResult);
   }
 
   void _assertTrue(String source) {
@@ skipping 539 matching lines @@
     expect(UriKind.fromEncoding(0x70), same(UriKind.PACKAGE_URI));
     expect(UriKind.fromEncoding(0x58), same(null));
   }
 
   void test_getEncoding() {
     expect(UriKind.DART_URI.encoding, 0x64);
     expect(UriKind.FILE_URI.encoding, 0x66);
     expect(UriKind.PACKAGE_URI.encoding, 0x70);
   }
 }