Merge the Round trait into the Float trait

Move the rounding functions into the `std::num::Float` trait and then remove `std::num::Round`.

This continues the flattening of the numeric traits tracked in #10387. The aim is to make `std::num` very simple and tied to the built in types, leaving the definition of more complex numeric towers to third-party libraries.

[breaking-change]
Have floating point functions take their parameters by value.

Make all of the methods in `std::num::Float` take `self` and their other parameters by value.

Some of the `Float` methods took their parameters by value, and others took them by reference. This standardises them to one convention. The `Float` trait is intended for the built in IEEE 754 numbers only so we don't have to worry about the trait serving types of larger sizes.

[breaking-change]
Fix formatting in float implementations
Reorder Float methods in trait definition and make consistent in impls
Implement Show for &mut [T]
native: Unlink unix socket paths on drop

This prevents unix sockets from remaining on the system all over the place, and
more closely mirrors the behavior of libuv and windows pipes.
There are no 64-bit Windows snapshots yet, so we'll use 32-bit ones instead.
Upgrade compiler-rt
add volatile copy/copy_nonoverlapping/set

This exposes volatile versions of the memset/memmove/memcpy intrinsics.

The volatile parameter must be constant, so this can't simply be a
parameter to our intrinsics.
Add a span to ast::TyParam
Support unsized types with the `type` keyword
Check for unsized types in enums.

And allow the last field of a struct or variant to be unsized.
Added examples for parse_bytes(buf: &[u8], radix: uint) in int_macros.rs and uint_macros.rs
Removed trailing whitespace in on line 242 in int_macros.rs and on line 156 in uint_macros.rs
Fixed Win64 build
Review changes
auto merge of #13398 : nick29581/rust/unsized-enum, r=nikomatsakis

Now with proper checking of enums and allows unsized fields as the last field in a struct or variant. This PR only checks passing of unsized types and distinguishing them from sized ones. To be safe we also need to control storage.

Closes issues #12969 and #13121, supersedes #13375 (all the discussion there is valid here too).
auto merge of #13597 : bjz/rust/float-api, r=brson

This pull request:

- Merges the `Round` trait into the `Float` trait, continuing issue #10387.
- Has floating point functions take their parameters by value.
- Cleans up the formatting and organisation in the definition and implementations of the `Float` trait.

More information on the breaking changes can be found in the commit messages.
auto merge of #13687 : exscape/mut-vector-Show/master, r=alexcrichton

Removes the need for hacks to println! mutable slices, among other things.
auto merge of #13690 : alexcrichton/rust/unlink-unix-pipe, r=brson

This prevents unix sockets from remaining on the system all over the place, and
more closely mirrors the behavior of libuv and windows pipes.