Fixes: rust-lang#72457, rust-lang#71895

Support for both can be useful when creating new firmware, boot loaders,
or embedded operating systems.

This allows us to return borrows of the captured backtrace frames
that are tied to a borrow of the Backtrace itself, instead of to
some short-lived Mutex guard.

It also makes it semantically clearer what synchronization is needed
on the capture.

Per rust-lang#80832, using
--pretty=expanded and --remap-path-prefix results in an ICE.

This is becasue the session source files table is stored in remapped
form, whereas --pretty-expanded looks up unremapped files. This remaps
the path prefixes before lookup.

…2, r=davidtwco,wesleywiser"

This reverts commit ddf2cc7, reversing
changes made to 937f629.

Co-authored-by: Joshua Nelson <joshua@yottadb.com>

…tebank

diagnostics: Note capturing closures can't be coerced to fns

Fixes rust-lang#72457, fixes rust-lang#71895

r? `@estebank`

Provide more information for HRTB lifetime errors involving closures

Remove redundant def_id lookups

Simplify `DefId -> LocalDefId -> HirId -> LocalDefId -> DefId` chains.

Added support for i386-unknown-linux-gnu and i486-unknown-linux-gnu

Support for both can be useful when creating new firmware, boot loaders,
or embedded operating systems.

use Once instead of Mutex to manage capture resolution

For rust-lang#78299

This allows us to return borrows of the captured backtrace frames that are tied to a borrow of the Backtrace itself, instead of to some short-lived Mutex guard.

We could alternatively share `&Mutex<Capture>`s and lock on-demand, but then we could potentially forget to call `resolve()` before working with the capture. It also makes it semantically clearer what synchronization is needed on the capture.

cc `@seanchen1991` `@rust-lang/project-error-handling`

Update to LLVM 11.0.1

This updates to a new LLVM branch, rebased on the upstream `llvmorg-11.0.1`. All our patches applied cleanly except the fortanix unwind changes, which just needed a small adjustment in cmake files.

r? `@nikic`
Fixes rust-lang#73722

Fix --pretty=expanded with --remap-path-prefix

Per rust-lang#80832, using
--pretty=expanded and --remap-path-prefix results in an ICE.

This is becasue the session source files table is stored in remapped
form, whereas --pretty-expanded looks up unremapped files. This remaps
the path prefixes before lookup.

~~There don't appear to be any existing tests for --pretty=expanded; I'll look into
adding some.~~ Never mind, found the pretty tests.

Fixes rust-lang#80832

…debug, r=wesleywiser

Revert "Auto merge of rust-lang#76896 - spastorino:codegen-inline-fns2

This reverts commit ddf2cc7, reversing
changes made to 937f629.

As `@alexcrichton` pointed out in rust-lang#80916 there's a problem with the taken approach.

Fix rustdoc --test-builder argument parsing

My suggested fix to issue rust-lang#80893. I can actually hook Miri in there now.

I also fixed what I believe to be a typo in the option's help text.

…e, r=petrochenkov

Rename `rustc_middle::lint::LevelSource` to `LevelAndSource`

This continues work in rust-lang#80274 to improve code readability.

This naming follows a pattern seen elsewhere in the compiler (e.g. [`rustc_middle::ty::TypeAndMut`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TypeAndMut.html)).