First pass at more complex constant expressions#1164

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jwise wants to merge 3 commits intorust-lang:masterfrom

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Commits on Nov 9, 2011

middle: Add a pass to reject bad const expressions earlier. Currently just rejects unimplemented const expressions, but will be needed later.
jwise
committed
trans: Add binops (except for logic and comparators) and unops to trans_const_expr. Working towards issue #570.
jwise
committed
Add test with implemented bits of issue #570.
jwise
committed