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Compile time constants lose their const-ness if they are referred to through a deferred prefix. This CL adds a flag to some ast node types that remembers whether a field or closure was referred to via a deferred prefix. If so, the compile-time const analysis flags the value as non-const. R=srdjan@google.com Review URL: https://codereview.chromium.org//226953002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@34785 260f80e4-7a28-3924-810f-c04153c831b5