repr-type specific oflo checks for enum discrim values.#23841

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pnkfelix wants to merge 3 commits intorust-lang:masterfrom

pnkfelix:check-discrim-oflo-issue-23030

Commits on Mar 31, 2015

Added type-specific overflow checks when computing enum discriminant values.
pnkfelix
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Added tests for discriminant overflows.
pnkfelix
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Fix #23890: const-eval `_ as usize`, `_ as isize` must dispatch to target type.
pnkfelix
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