Rustup

My previous rustup PR was broken. I didn't realize that "nothing to commit, working tree clean" meant "I didn't actually do the full pull properly, stop and inspect manually"...

Rustup

…RalfJung

Avoid interpreting code that has lint errors

fixes rust-lang#2608

we previously only checked for actual errors, as deny lints are handled differently.

Rustup

Rustup

This *should* fail because of rust-lang/miri#2874 but it seems we don't actually cover that in our tests...

clearer variable names in data_race

Co-authored-by: Ralf Jung <post@ralfj.de>

Simplify event selection in TB diagnostics

As discussed previously, getting the range from `RangeMap` can make the filtering of events much simpler without any user-visible diff.

See minor exception in [<9d8fc00>](rust-lang/miri@9d8fc00) and decide how to resolve it
- add a boolean flag not to record events produced by deallocations ?
- add a `help: deallocation counts as an implicit write` ? (Note: could be generalized to also include `help: reborrow counts as an implicit read`)
- not bother and keep as-is ?
- something else ?

Rustup

increase timing slack for sync tests; port tests to 2021 edition

Also stops using github actions groups that conflict with our groups as github does not nest them

Update to latest ui_test crate version.

Also stops using github actions groups that conflict with our groups as github does not nest them

including accurate eq impl for UniMap

Co-authored-by: Ralf Jung <post@ralfj.de>

Thorough merge after GC: fix of rust-lang#2863

Context: rust-lang#2863.

`perf report`s of `MIRIFLAGS=-Zmiri-tree-borrows cargo +miri miri test test_invalid_name_lengths` in crate `http`:

### Pre
```
  91.06%  rustc    miri                                 [.] miri::borrow_tracker::tree_borrows::tree::Tree::keep_only_needed
   2.99%  rustc    miri                                 [.] miri::borrow_tracker::tree_borrows::tree::TreeVisitor::traverse_parents_this
   0.91%  rustc    miri                                 [.] miri::borrow_tracker::tree_borrows::tree::Tree::perform_access
   0.62%  rustc    miri                                 [.] miri::range_map::RangeMap<T>::iter_mut
   0.17%  rustc    libc.so.6                            [.] realloc
   0.14%  rustc    miri                                 [.] miri::concurrency::thread::EvalContextExt::run_threads
   0.13%  rustc    miri                                 [.] rustc_const_eval::interpret::operand::<impl rustc_const_eval::interpret::eva
   0.13%  rustc    miri                                 [.] hashbrown::raw::RawTable<T,A>::remove_entry
   0.10%  rustc    miri                                 [.] miri::intptrcast::GlobalStateInner::alloc_base_addr
   0.08%  rustc    librustc_driver-c82c1dc22c817a10.so  [.] <rustc_middle::mir::Body>::source_info
```
Interrupted after 3min 30s.

### Post
```
  20.75%  rustc    miri                                 [.] miri::borrow_tracker::tree_borrows::tree::TreeVisitor::traverse_parents_this
  18.50%  rustc    miri                                 [.] miri::borrow_tracker::tree_borrows::tree::Tree::keep_only_needed
   6.49%  rustc    miri                                 [.] miri::borrow_tracker::tree_borrows::tree::Tree::perform_access
   4.25%  rustc    miri                                 [.] miri::range_map::RangeMap<T>::iter_mut
   1.91%  rustc    libc.so.6                            [.] realloc
   1.79%  rustc    miri                                 [.] miri::concurrency::thread::EvalContextExt::run_threads
   1.40%  rustc    miri                                 [.] rustc_const_eval::interpret::operand::<impl rustc_const_eval::interpret::eva
   1.40%  rustc    miri                                 [.] miri::range_map::RangeMap<T>::merge_adjacent_thorough
   1.34%  rustc    miri                                 [.] miri::intptrcast::GlobalStateInner::alloc_base_addr
   0.90%  rustc    librustc_driver-c82c1dc22c817a10.so  [.] <rustc_middle::ty::context::CtxtInterners>::intern_ty
```
Terminates after 1min 13s.

No significant changes to `./miri bench` in either direction: on small benches not enough garbage accumulates for this to be relevant.

Rustup

Include the current Crate name in the measureme output name

See https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/measureme.20flamegraph.20panics/near/356367013
cc `@andjo403`

Currently, attempting to use `MIRIFLAGS=-Zmiri-measureme=miri cargo miri test` on a crate with multiple test targets (which is very common) will produce a corrupted measureme output file, because the various interpreter processes will stomp each other's output.

This change does not entirely prevent this, but the various test targets seem to always have different crate names, so if nothing else this will make the broken measureme files much harder to encounter by accident, while also making it clear what they are all for.