These are LLVM target features which allow the `smc` and `hvc`
instructions respectively to be used in inline assembly.

Add trustzone and virtualization target features for aarch32.

These are LLVM target features which allow the `smc` and `hvc` instructions respectively to be used in inline assembly.

…inking, r=davidtwco

Make compiletest aware of targets without dynamic linking

Some parts of the compiletest internals and some tests require dynamic linking to work, which is not supported by all targets. Before this PR, this was handled by if branches matching on the target name.

This PR loads whether a target supports dynamic linking or not from the target spec, and adds a `// needs-dynamic-linking` attribute for tests that require it. Note that I was not able to replace all the old conditions based on the target name, as some targets have `dynamic_linking: true` in their spec but pretend they don't have it in compiletest.

Also, to get this to work I had to *partially* revert rust-lang#111472 (cc `@djkoloski` `@tmandry` `@bjorn3).` On one hand, only the target spec contains whether a target supports dynamic linking, but on the other hand a subset of the fields can be overridden through `-C` flags (as far as I'm aware only `-C panic=$strategy`). The solution I came up with is to take the target spec as the base, and then override the panic strategy based on `--print=cfg`. Hopefully that should not break y'all again.

…shtriplett

Allow comparing `Box`es with different allocators

Currently, comparing `Box`es over different allocators is not allowed:
```Rust
error[E0308]: mismatched types
  --> library/alloc/tests/boxed.rs:22:20
   |
22 |     assert_eq!(b1, b2);
   |                    ^^ expected `Box<{integer}, ConstAllocator>`, found `Box<{integer}, AnotherAllocator>`
   |
   = note: expected struct `Box<{integer}, ConstAllocator>`
              found struct `Box<{integer}, AnotherAllocator>`

For more information about this error, try `rustc --explain E0308`.
error: could not compile `alloc` (test "collectionstests") due to previous error
```
This PR lifts this limitation

…le-options, r=davidtwco

Provide more context for `rustc +nightly -Zunstable-options` on stable

<img width="724" alt="Screenshot 2023-06-16 123456" src="https://github.com/rust-lang/rust/assets/39484203/1933e172-cb9f-4e51-9540-ade803a88360">

Closes rust-lang#110090.

Make `UnwindAction::Continue` explicit in MIR dump

Makes it easier to spot unwinding related issues in MIR by making `UnwindAction::Continue` explicit, just like all other `UnwindAction`s.

…a-obj-unless-denied, r=compiler-errors

Add tests impl via obj unless denied

Fixes rust-lang#112737

Add simple tests to check feature change in rust-lang#112320 is performing as expected.

Note:

- Unsure about filenames, locations & function signature names (tried to make them something sensible)

Simplify some conditions

r? `@Nilstrieb`

Some things taken out of my `is_none_or` pr.

…mpiler-errors

Normalize types when applying uninhabited predicate.

Fixes rust-lang#112997