arithmetic-overflow checks during const-eval#23863

Merged

bors merged 16 commits intorust-lang:masterfrom

pnkfelix:arith-oflo-const-eval

Apr 1, 2015

Commits on Apr 1, 2015

Added type-specific overflow checks when computing enum discriminant values.
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Added tests for discriminant overflows.
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fix post rebase.
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Fix #23890: const-eval `_ as usize`, `_ as isize` must dispatch to target type.
pnkfelix
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Added overflowing_{div,rem,shl,shr} method implementations to WrappingOps.
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Refactored ty::ctxt so node_types mutations must go through ty methods.
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ty.rs improve error feedback when const-eval errs during repeat count eval.
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rust_llvm: Add way to reflectively ask if a ValueRef is a known constant int.
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rustc::middle::const_eval : add overflow-checking for {+, -, *}.
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rustc_trans::trans::consts add overflow checking
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Fallout from changes for overflow-checking during constant evaluation.
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Test cases for checking arithmetic overflow during const eval.
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Include feature `core` to get access to `wrapping_add`.
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Fixes to compile-fail error messages post-rebase.
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Unify handling of checking repeat-count validity.
pnkfelix
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dealing with fallout to the tests, in particular diffs between 32- vs 64-bit targets.
pnkfelix
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