updated hash value in reduced benchmark
Fix lifetime error to print `'a` instead of `&'a`

This changes certain error messages about lifetimes so that they display
lifetimes without an `&`.

Fixes #10291.
Minor library doc copyediting
auto merge of #14359 : brson/rust/minordoc, r=alexcrichton
auto merge of #14368 : tedhorst/rust/master, r=alexcrichton
std: Move running_on_valgrind to rt::util. #1457

[breaking-change]
std: Move simd to core::simd and reexport. #1457

[breaking-change]
std: Move unstable::finally to std::finally. #1457

[breaking-change]
core: Document simd mod
core: Derive Show on SIMD types
auto merge of #14317 : P1start/rust/lifetime-formatting, r=alexcrichton

This changes certain error messages about lifetimes so that they display lifetimes without an `&`.

Fixes #10291.
auto merge of #14379 : brson/rust/simd, r=alexcrichton

Followup to https://github.com/mozilla/rust/pull/14331 and https://github.com/mozilla/rust/pull/12524