Auto merge of #149132 - matthiaskrgr:rollup-8khp9s2, r=matthiaskrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang/rust#146925 (Add doc for va_list APIs)
 - rust-lang/rust#147035 (alloc: fix `Debug` implementation of `ExtractIf`)
 - rust-lang/rust#147173 (Add support for hexagon-unknown-qurt target)
 - rust-lang/rust#148261 (rustc_public: Make Id types !Send / !Sync)
 - rust-lang/rust#149041 (ignore unsized types in mips64 and sparc64 callconvs)
 - rust-lang/rust#149056 (fix the fragment_in_dst_padding_gets_overwritten test on s390x)
 - rust-lang/rust#149071 (Add test scaffolding for the `remote-test-client`)
 - rust-lang/rust#149095 (rustc-dev-guide subtree update)
 - rust-lang/rust#149108 ([AIX][ppc64le-linux-gnu] Add Amy Kwan to target maintainers)

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

Author: bors