Compute type fragments left over from moves#17439

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pnkfelix wants to merge 12 commits intorust-lang:masterfrom

pnkfelix:fsk-type-fragments-for-needsdrop

Commits on Sep 22, 2014

Added type fragmentation code to compute drop obligations remaining post move.
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Track what drop obligations are established on match arms.
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Distinguish move semantics for `a @ Var(_)` from that of `Var(_)`.
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Code to compute the fragment siblings and add them to the dataflow inputs.
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Add `node_to_user_string`, `node_to_string` variant that drops id from output.
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Add `span_end_err` as a way to print an error message at the *end* of a span.
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Added code to emit the gen/kill sets in source annotated form.
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Tests illustrating the `rustc_drop_obligations` instrumentation attribute.
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