update Miri

This contains the concurrency support by @vakaras :)

Fixes https://github.com/rust-lang/rust/issues/71729
r? @ghost
Cc @rust-lang/miri

Make clippy a git subtree instead of a git submodule

r? @EddyB

cc #70651

documentation at https://github.com/rust-lang/rust/pull/70654

Rollup of 6 pull requests

Successful merges:

 - #71712 (Miri: port error backtraces to std::backtrace)
 - #71736 (bootstrap: also apply unused-attributes hack without deny_warnings)
 - #71738 (remove AllocId generalization of Pointer)
 - #71739 (remove obsolete comment)
 - #71781 (Uncomment test code for failure to use `Box::pin`)
 - #71782 (Use a non-existent test path instead of clobbering /dev/null)

Failed merges:

r? @ghost

Use a non-existent test path instead of clobbering /dev/null

Fixes #71502.
r? @Mark-Simulacrum

Uncomment test code for failure to use `Box::pin`

Close #69083.

remove obsolete comment

Referenced was removed in 9f492fef

remove AllocId generalization of Pointer

This was only needed for the "snapshot" machinery, which is gone.

r? @oli-obk

bootstrap: also apply unused-attributes hack without deny_warnings

This is a follow-up to https://github.com/rust-lang/rust/pull/70881 that also silences these warnings when deny_warnings is off. They otherwise spam my screen during development and make it hard to see actual warnings.

Cc  @EddyB r? @Mark-Simulacrum

Miri: port error backtraces to std::backtrace

No need to pull in an external dependency if libstd already includes this feature (using the same dependency internally, but... still).

r? @oli-obk

git-subtree-dir: src/tools/clippy
git-subtree-mainline: 06c44816
git-subtree-split: d2708873

wf: handle "livelock" checking before reaching `WfPredicates::compute`.

For `wf::obligations`'s "livelock" handling, this PR shouldn't cause any behavioral changes, as the check moved to it should be equivalent to the old one in `WfPredicates::compute`.

However, it fixes #70168 by making *other* users of `WfPredicates::compute` (that is, `wf::predicate_obligations` and `compute`'s own upvar handling) correct for `ty::Infer`, in that they now get a `WellFormed(ty::Infer(_))` obligation instead of silently ignoring the type.

r? @nikomatsakis

Rename `bitcode-in-rlib` option to `embed-bitcode`

This commit finishes work first pioneered in #70458 and started in #71528.
The `-C bitcode-in-rlib` option, which has not yet reached stable, is
renamed to `-C embed-bitcode` since that more accurately reflects what
it does now anyway. Various tests and such are updated along the way as
well.

This'll also need to be backported to the beta channel to ensure we
don't accidentally stabilize `-Cbitcode-in-rlib` as well.

Rollup of 5 pull requests

Successful merges:

 - #71018 (handle ConstValue::ByRef in relate)
 - #71758 (Remove leftover chalk types)
 - #71760 (Document unsafety for `*const T` and `*mut T`)
 - #71761 (doc: reference does not exist, probably a typo)
 - #71762 (doc: this resulted in a link pointing to a non-existent target)

Failed merges:

 - #71726 (Suggest deref when coercing `ty::Ref` to `ty::RawPtr` with arbitrary mutability)

r? @ghost

Close #69083.

doc: this resulted in a link pointing to a non-existent target

doc: reference does not exist, probably a typo

Document unsafety for `*const T` and `*mut T`

Helps with #66219
r? @Mark-Simulacrum

Remove leftover chalk types

Split out from #69406

Since the other PR is having memory problems with `parallel-compiler = true`, figured I should split this out. Surprisingly, this actually changes some errors, and I'm not quite sure why.

r? @nikomatsakis

handle ConstValue::ByRef in relate

fixes #68615

r? @EddyB

Avoid duplicating code for each query

There are at the moment roughly 170 queries in librustc.
The way `ty::query` is structured, a lot of code is duplicated for each query.
I suspect this to be responsible for a part of librustc'c compile time.

The first part of this PR reduces the amount of code generic on the query,
replacing it by code generic on the key-value types. I can split it out if needed.

In a second part, the non-inlined methods in the `QueryAccessors` and `QueryDescription` traits
are made into a virtual dispatch table. This allows to reduce even more the number of generated
functions.

This allows to save 1.5s on check build, and 10% on the size of the librustc.rlib.
(Attributed roughly half and half).
My computer is not good enough to measure properly compiling time.
I have no idea of the effect on performance. A perf run may be required.

cc #65031

Rollup of 5 pull requests

Successful merges:

 - #71744 (remove obsolete comment)
 - #71747 (Remove deadcode in eval_mir_constant_to_operand)
 - #71749 (fix Miri error message padding)
 - #71752 (make Stability doc a more readable (and fix rustdoc warning))
 - #71755 (fix doc reference)

Failed merges:

r? @ghost

fix doc reference

Should of been in e0ce9f8c,
but that had a typo.

make Stability doc a more readable (and fix rustdoc warning)

fix Miri error message padding

I screwed up in the previous PR, and accidentally padded with spaces instead of 0s...

r? @oli-obk

Remove deadcode in eval_mir_constant_to_operand

r? @oli-obk @RalfJung

remove obsolete comment

Referenced was removed in 8770d0f3

mismatched_target_os: link to respective section in rust reference

changelog: none

This commit finishes work first pioneered in #70458 and started in #71528.
The `-C bitcode-in-rlib` option, which has not yet reached stable, is
renamed to `-C embed-bitcode` since that more accurately reflects what
it does now anyway. Various tests and such are updated along the way as
well.

This'll also need to be backported to the beta channel to ensure we
don't accidentally stabilize `-Cbitcode-in-rlib` as well.

Should of been in e0ce9f8c,
but that had a typo.