bors 9ff308137a auto merge of #17428 : fhahn/rust/issue-16114-rename-begin-unwind-2, r=alexcrichton
This is a PR for #16114 and includes to following things:

* Rename `begin_unwind` lang item to `fail_fmt`
*  Rename `core::failure::begin_unwind` to `fail_impl`
* Rename `fail_` lang item to `fail`
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