```rust
error[E0072]: recursive type `X` has infinite size
  --> file.rs:10:1
   |
10 | struct X {
   | ^^^^^^^^ recursive type has infinite size
   |
   = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `X` representable
```

vs

```rust
error[E0072]: recursive type `X` has infinite size
  --> file.rs:10:1
   |
10 |   struct X {
   |  _^ starting here...
11 | |     x: X,
12 | | }
   | |_^ ...ending here: recursive type has infinite size
   |
   = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `X` representable
```

There was a serious ARM codegen bug in LLVM that was fixed by rust-lang#40779,
also backported to beta.  This updates stage0 to 1.17.0-beta.3 to pick
up that change, so ARM can bootstrap natively again.

Fixes rust-lang#41291
cc @arielb1

The only non-overridden one remaining is the CStr impl, which cannot
be optimized as doing so would break CString's second invariant.

cc rust-lang#32730 -- I left exactly one instance where I wasn't sure of the
right behavior.

…nkov

Add a way to get shorter spans until `char` for pointing at defs

```rust
error[E0072]: recursive type `X` has infinite size
  --> file.rs:10:1
   |
10 | struct X {
   | ^^^^^^^^ recursive type has infinite size
   |
   = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `X` representable
```

vs

```rust
error[E0072]: recursive type `X` has infinite size
  --> file.rs:10:1
   |
10 |   struct X {
   |  _^ starting here...
11 | |     x: X,
12 | | }
   | |_^ ...ending here: recursive type has infinite size
   |
   = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `X` representable
```

Re: rust-lang#35965,  rust-lang#38246. Follow up to rust-lang#38328.

r? @jonathandturner

Bump stage0 to fix ARM LLVM

There was a serious ARM codegen bug in LLVM that was fixed by rust-lang#40779,
also backported to beta.  This updates stage0 to 1.17.0-beta.3 to pick
up that change, so ARM can bootstrap natively again.

Fixes rust-lang#41291
cc @arielb1

…nce, r=eddyb

Fix ICE building gluon_vm

The problem was due to various places we were failing to propagate obligations. I think I got them mostly correct, but I didn't get around to writing test cases for each case.

r? @eddyb or @arielb1

…elb1

rustc_trans: do not treat byval as using up registers.

Perhaps not that well-documented, `byval` pointer arguments *are not* the same as pointer arguments used by pass-by-ref, but rather the pointer is only used by LLVM to pass the *contents* on the stack.

Fixes rust-lang#41375.

…crichton

Override ToOwned::clone_into for Path and OsStr

The only non-overridden one remaining is the CStr impl, which cannot
be optimized as doing so would break CString's second invariant.

Follow-up to 7ec27ae (PR rust-lang#41009).

r? @alexcrichton