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This is the first part of the patch refactoring which implements a stub version of the invariants needed for the new patch implementation. See the library comment in lib/compiler/patch_parser.dart for a detailed description of the new patch system, the terminology and the invariants. Review URL: https://codereview.chromium.org//10917285 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12687 260f80e4-7a28-3924-810f-c04153c831b5