LLVM will insert calls to the stack protector functions
"__stack_chk_fail" and "__stack_chk_guard" into code in native object
files.  Some platforms include these symbols directly in libc, but at
least historically these have been provided in libssp.so on illumos and
Solaris systems.  Include "-lssp" in the arguments to the linker when
building for those targets.

…le from globals

It appears to codegen slightly more efficiently with `split_at` taking
two slices at once, rather than slicing across different calls.

It can try to keep its allocation by converting the inner `Box` to
`Vec`, using `clone_into` on the bytes, then convert back to `Box`.

Despite OS differences, they're all just `Vec<u8>` inside, so we can
just forward `clone_into` calls to that optimized implementation.

Small tweaks in ToOwned::clone_into

- `<[T]>::clone_into` is slightly more optimized.
- `CStr::clone_into` is new, letting it reuse its allocation.
- `OsStr::clone_into` now forwards to the underlying slice/`Vec`.

link with "libssp" on *-sun-solaris systems

LLVM will insert calls to the stack protector functions
"__stack_chk_fail" and "__stack_chk_guard" into code in native object
files.  Some platforms include these symbols directly in libc, but at
least historically these have been provided in libssp.so on illumos and
Solaris systems.  Include "-lssp" in the arguments to the linker when
building for those targets.

Miri leak check: memory reachable through globals is not leaked

Also make Miri memory dump prettier by sharing more code with MIR dumping, and fix a bug where the Miri memory dump would print some allocations twice.

r? @oli-obk

Miri PR: rust-lang/miri#1301

…nits, r=alexcrichton

Keep codegen units unmerged when building compiler builtins

Make it possible to control how mono items are partitioned into code generation
units, when compiling the compiler builtins, by retaining the original partitioning.

Helps with rust-lang#48625, rust-lang#61063, rust-lang#67960, rust-lang#70489.

r? @alexcrichton

…tolnay

Use assoc int submodules

Bumping some submodules to the commits their masters currently point at. The main point of this is to get the associated integer/float constant documentation updates that were recently merged to them:

* rust-lang/nomicon#207
* rust-lang/rust-by-example#1327
* rust-lang/stdarch#848

But for some, a few more changes slipped by that happened to be in the master branch of these submodules.

r? @dtolnay

…=dtolnay

Don't import integer and float modules, use assoc consts 2

Follow up to rust-lang#70777. I missed quite a lot of places. Partially because I wanted to keep the size of the last PR down, and partially because my regexes were not good enough :)

r? @dtolnay