On Linux, use mmap64, open64, openat64, and sendfile64 in place of their
non-LFS counterparts.

This is relevant to rust-lang#94173.

With these changes (together with rust-lang/backtrace-rs#501), the
simple binaries I produce with rustc seem to have no non-LFS functions,
so maybe rust-lang#94173 is fixed. But I can't be sure if I've missed something
and maybe some non-LFS functions could sneak in somehow.

.. for now. I have been burned out a bit from reviews
and I think I should take a break.

Use more LFS functions.

On Linux, use mmap64, open64, openat64, and sendfile64 in place of their non-LFS counterparts.

This is relevant to rust-lang#94173.

With these changes (together with rust-lang/backtrace-rs#501), the simple binaries I produce with rustc seem to have no non-LFS functions, so maybe rust-lang#94173 is fixed. But I can't be sure if I've missed something and maybe some non-LFS functions could sneak in somehow.

…orn3

Fix transmutes between pointers in different address spaces (e.g. fn ptrs on AVR)

Currently, this causes a verifier error (https://godbolt.org/z/YYohed4bj), since it uses `bitcast`, which can't convert between address spaces.

Uncovered due to rust-lang#105545 (comment)

r? `@bjorn3`

explain mem::forget(env_lock) in fork/exec

I stumbled upon this while doing triage for rust-lang#64718.

…yn514

Fix unsoundness in bootstrap cache code

Discovered via rust-lang#105575, which showed that rustc was failing to build during a perf run.

Add a test for rust-lang#92481

The test was copied ad-hoc from rust-lang#92481, but I can't get the test to pass, because of needing to get twice the same error on the last line of the source.

Closes rust-lang#92481

…-name, r=notriddle

Improve rustdoc markdown variable naming

Opened on the right repository this time. 😆

r? `@notriddle`

…Mark-Simulacrum

Remove fee1-dead from reviewers

.. for now. I have been burned out a bit from reviews and I think I should take a break.