… differ

Asked in rust-lang#104248

Since it looks like there won't be any reverts needed in `Layout`, finish off this change.

prevent uninitialized access in black_box for zero-sized-types

Don't read the pointer location in black_box for zero sized types, just emit a memory clobber instead. Addresses  rust-lang#103304 when rust is build against LLVM at HEAD.

Zulip thread: https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/.28with.20llvm.20at.20HEAD.29.3A.20msan.20error.20in.20core.3A.3Ahint.3A.3Ablack_box

…ckh726

Mark `trait_upcasting` feature no longer incomplete.

This marks the `trait_upcasting` feature no longer incomplete since rust-lang#101336 has been settled for a little while.

r? `````@jackh726`````

…ry-dot, r=fee1-dead

Suggest removing unnecessary `.` to use a floating point literal

Fixes a part of rust-lang#101883

…ink-color, r=notriddle

Migrate no result page link color to CSS variables

r? `@notriddle`

…d-differ, r=estebank

More accurately report error when formal and expected signature types differ

Fixes rust-lang#104242

…g-zeroes-docs, r=scottmcm

Add a reference to ilog2 in leading_zeros integer docs

Fixes rust-lang#104248

Remove the old `ValidAlign` name

Since it looks like there won't be any reverts needed in `Layout` for rust-lang#101899 (comment), finish off this change that I'd left out of rust-lang#102072.

r? `@thomcc`
cc tracking issue rust-lang#102070

…ource-link, r=notriddle

Fix non clickable source link

Fixes rust-lang#104313.

It was also fixed in rust-lang#104177. If rust-lang#104177 is merged first, I'll simply remove the first commit to keep the test.

r? `@notriddle`