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- Invalidate MirrorSystem.libraries when a load completes. - Recheck if a deferred import's target has been loaded before failing. - Allow loading libraries from a LibraryDepedencyMirror. - Propogate compile-time error when attempting to reflect a deferred type. BUG=http://dartbug.com/22592 R=asiva@google.com, gbracha@google.com Review URL: https://codereview.chromium.org//1095903002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45444 260f80e4-7a28-3924-810f-c04153c831b5