Clang and gcc use this option to control linking behavior too. Some
targets need to be linked against a special crt which enables
profiling at runtime.

This makes using gprof a little easier with Rust binaries. Otherwise,
rustc must be passed `-Clink-args=-pg` to ensure the correct startup
code is linked.

mingw exposes the `_mcount` symbol for profiling.

libgmon needs to be linked. This also requires readding a few
other system libraries to satisfy its dependencies.

```
error[E0061]: this method takes 0 arguments but 1 argument was supplied
  --> $DIR/shadowed-intrinsic-method.rs:18:7
   |
LL |     a.borrow(());
   |       ^^^^^^ -- unexpected argument of type `()`
   |
note: the `borrow` call is resolved to the method in `std::borrow::Borrow`, shadowing the method of the same name on the inherent impl for `A`
  --> $DIR/shadowed-intrinsic-method.rs:18:7
   |
LL | use std::borrow::Borrow;
   |     ------------------- `std::borrow::Borrow` imported here
...
LL |     a.borrow(());
   |       ^^^^^^ refers to `std::borrow::Borrow::borrow`
note: method defined here
  --> $SRC_DIR/core/src/borrow.rs:LL:COL
help: you might have meant to call the other method; you can use the fully-qualified path to call it explicitly
   |
LL -     a.borrow(());
LL +     A::borrow(&mut a, ());
   |
help: remove the extra argument
   |
LL -     a.borrow(());
LL +     a.borrow();
   |
```

Handle correct gramar in the face of a single other option, or many.

* Create GPU target notification group
* Update triagebot.toml

Co-authored-by: 许杰友 Jieyou Xu (Joe) <39484203+jieyouxu@users.noreply.github.com>

Pass -pg to linker when using -Zinstrument-mcount

This selects a slightly different crt on gnu targets which enables the profiler within glibc.

This makes using gprof a little easier with Rust binaries. Otherwise, rustc must be passed `-Clink-args=-pg` to ensure the correct startup code is linked.

…rray-ice, r=chenyukang

Remove divergence check from check_expr_array

Fixes rust-lang#153695.

`check_expr_array` currently assumes it should only be entered with` self.diverges == Diverges::Maybe`, but that assumption does not appear to hold in all valid cases. A never-pattern parameter can seed a function or closure body with inherited `Diverges::Always`, and exprs in that body are still typecked.

move many tests out of `ui/unsafe`

`ui/unsafe` is a pretty big and generic directory. This PR moves some tests from it to `ui/union` and some others to a new `rustc_layout_scalar_valid_range` directory.
r? @Kivooeo

…bzol

bootstrap: force a CI LLVM stamp bump

To see if this helps with rust-lang#154408

r? @Kobzol

…ath, r=davidtwco

Suggest fully qualified path on method name collision

Provide suggestion for using a fully qualified path when method names collide between traits and inherent impl.

```
error[E0061]: this method takes 0 arguments but 1 argument was supplied
  --> $DIR/shadowed-intrinsic-method.rs:20:7
   |
LL |     a.borrow(());
   |       ^^^^^^ -- unexpected argument of type `()`
   |
note: the `borrow` call is resolved to the method in `std::borrow::Borrow`, shadowing the method of the same name on the inherent impl for `A`
  --> $DIR/shadowed-intrinsic-method.rs:20:7
   |
LL | use std::borrow::Borrow;
   |     ------------------- `std::borrow::Borrow` imported here
...
LL |     a.borrow(());
   |       ^^^^^^ refers to `std::borrow::Borrow::borrow`
note: method defined here
  --> $SRC_DIR/core/src/borrow.rs:LL:COL
help: you might have meant to call the other method; you can use the fully-qualified path to call it explicitly
   |
LL -     a.borrow(());
LL +     A::borrow(&mut a, ());
   |
help: remove the extra argument
   |
LL -     a.borrow(());
LL +     a.borrow();
   |
```

Fix rust-lang#54103.

simd_add/sub/mul/neg: document overflow behavior

`simd_neg` had an odd comment about overflow not being UB, without saying what the behavior is instead. Replace that by just saying this uses wrapping arithmetic, and add the same for add/sub/mul. div/rem are already documented to cause UB on div-by-zero and min-div-by-minus-one, and shl/shr cause UB on too large shift amounts.

…roup, r=jieyouxu

Create GPU target notification group

Creating the notification group for the newly created GPU target (see [mcp#960](https://rust-lang.zulipchat.com/#narrow/channel/233931-t-compiler.2Fmajor-changes/topic/Create.20a.20GPU.20notification.20group.20compiler-team.23960/near/568629680))

I'm following these [steps](rust-lang#133334).

(feel free to suggest a better wording)

r? @jieyouxu