Support redirecting factory constructors in Analyzer

[gbracha]

Per bug 3966

[bwilkerson]

Added Waiting label.

[bwilkerson]

Added Triaged label.

[bwilkerson]

Set owner to @bwilkerson.

[bwilkerson]

Added syntactic support in http://codereview.chromium.org/10872087/. I'm assuming that you'll add the support in the resolver and/or type analysis. Let me know if you think I should do that instead.

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Set owner to @scheglov.

[scheglov]

Added Accepted label.

[scheglov]

https://chromiumcodereview.appspot.com/10885031

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Added Started label.

[scheglov]

https://code.google.com/p/dart/source/detail?r=11532

[scheglov]

Added Fixed label.

[crelier]

There is something flaky about the support of factory redirection in dartc.
It does not look like negative cases are detected and reported correctly.
See related bug 5538. I am reopening this issue since there is more work.

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Added Accepted label.

[scheglov]

https://codereview.chromium.org/10983089

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Added Started label.

[scheglov]

https://code.google.com/p/dart/source/detail?r=13036

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Added Fixed label.