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This is the third and main part of the patch refactoring. Patch libraries, classes, and functions now have there separate element chain, which is doubly-linked to their origin counterparts. 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//10905305 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@13163 260f80e4-7a28-3924-810f-c04153c831b5