- Defer to Ipv4Addr::fmt when printing an Ipv4 address
- Fast path: write directly to f without an intermediary buffer when
  there are no alignment options
- Simplify finding the inner zeroes-span

Co-authored-by: Amanieu d'Antras <amanieu@gmail.com>

Miri's pointer_offset_inbounds implementation has been moved into
librustc_mir as ptr_offset_inbounds (to avoid breaking miri on a
nightly update). The comments have been slightly reworked to better
match `offset`'s external documentation about what causes UB.

The intrinsic implementations are taken directly from miri.

Signed-off-by: Joe Richey <joerichey@google.com>

Signed-off-by: Joe Richey <joerichey@google.com>

Signed-off-by: Joe Richey <joerichey@google.com>

Signed-off-by: Joe Richey <joerichey@google.com>

Signed-off-by: Joe Richey <joerichey@google.com>

This is tricky to get right if we want to avoid panicking or wrapping.

Signed-off-by: Joe Richey <joerichey@google.com>

The previous code paniced if offset_bytes == i64::MIN. This commit:
  - Properly computes the absoulte value to avoid this panic
  - Adds a test for this edge case

Signed-off-by: Joe Richey <joerichey@google.com>

…or packed borrows in unsafe fns

Detect type parameter that might require lifetime constraint.
Do not name `ReVar`s in expected/found output.
Reword text suggesting to check the lifetimes.

We now perform the correct checks even if the pointer size differs
between the host and target.

Signed-off-by: Joe Richey <joerichey@google.com>

Tweak impl signature mismatch errors involving `RegionKind::ReVar` lifetimes

Fix rust-lang#66406, fix rust-lang#72106.

```
error: `impl` item signature doesn't match `trait` item signature
  --> $DIR/trait-param-without-lifetime-constraint.rs:14:5
   |
LL |     fn get_relation(&self) -> To;
   |     ----------------------------- expected `fn(&Article) -> &ProofReader`
...
LL |     fn get_relation(&self) -> &ProofReader {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(&Article) -> &ProofReader`
   |
   = note: expected `fn(&Article) -> &ProofReader`
              found `fn(&Article) -> &ProofReader`
help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait`
  --> $DIR/trait-param-without-lifetime-constraint.rs:10:31
   |
LL |     fn get_relation(&self) -> To;
   |                               ^^ consider borrowing this type parameter in the trait
```

r? @nikomatsakis

Make pointer offset methods/intrinsics const

Implements rust-lang#71499 using [the implementations from miri](https://github.com/rust-lang/miri/blob/52f5d202bdcfe8986f0615845f8d1647ab8a2c6a/src/shims/intrinsics.rs#L96-L112).

I added some tests what's allowed and what's UB. Let me know if any other cases should be added.

CC: @RalfJung @oli-obk

linker: Support `-static-pie` and `-static -shared`

This PR adds support for passing linker arguments for creating statically linked position-independent executables and "statically linked" shared libraries.

Therefore it incorporates the majority of rust-lang#70740 except for the linker rerun hack and actually flipping the "`static-pie` is supported" switch for musl targets.

…afe-fn, r=nikomatsakis

Implement RFC 2585: unsafe blocks in unsafe fn

Tracking issue: rust-lang#71668
r? @RalfJung cc @nikomatsakis

…chievink

borrowck `DefId` -> `LocalDefId`

Replaces some `DefId`s which must always be local with `LocalDefId` in `librustc_mir/borrowck`.

cc @marmeladema

…lacrum

Various minor improvements to Ipv6Addr::Display

Cleaned up `Ipv6Addr::Display`, especially with an eye towards simplifying and reducing duplicated logic. Also added a fast-path optimization, similar to rust-lang#72399 and rust-lang#72398.

- Defer to `Ipv4Addr::fmt` when printing an Ipv4 address
- Fast path: write directly to `f` without an intermediary buffer when there are no alignment options
- Simplify finding the inner zeroes-span

…bk,eddyb

Miri read_discriminant: return a scalar instead of raw underlying bytes

r? @oli-obk @eddyb

NVPTX support for new asm!

This PR implements the new `asm!` syntax for the `nvptx64-nvidia-cuda` target.

r? @Amanieu