…kingjubilee

Rollup of 10 pull requests

Successful merges:

 - rust-lang#129103 (Don't warn empty branches unreachable for now)
 - rust-lang#129696 (update stdarch)
 - rust-lang#129835 (enable const-float-classify test, and test_next_up/down on 32bit x86)
 - rust-lang#130077 (Fix linking error when compiling for 32-bit watchOS)
 - rust-lang#130114 (Remove needless returns detected by clippy in the compiler)
 - rust-lang#130168 (maint: update docs for change_time ext and doc links)
 - rust-lang#130228 (notify Miri when intrinsics are changed)
 - rust-lang#130239 (miri: fix overflow detection for unsigned pointer offset)
 - rust-lang#130244 (Use the same span for attributes and Try expansion of ?)
 - rust-lang#130248 (Limit `libc::link` usage to `nto70` target only, not NTO OS)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of rust-lang#130228 - RalfJung:intrinsics-notify, r=saethlin

notify Miri when intrinsics are changed

`@rust-lang/miri` should we notify the entire team, or should I just add myself?