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Rollup of 14 pull requests

Successful merges:

 - #159126 (Fix PR number in bootstrap's change tracker)
 - #155811 (Include AtomicU128/AtomicI128 in docs for any target)
 - #156968 (diagnostics: suggest generic_const_args for const ops)
 - #159012 (Shrink mir::Statement to 40 bytes)
 - #156618 (rustdoc: test ignoring rustc lints in CLI)
 - #158182 (std: use `OnceLock` for SGX argument storage)
 - #159114 (Add regression test for $-prefixed fragment specifier in repetition)
 - #158523 (Fix feature gate for `repr(simd)`)
 - #158876 (Fix multiple logic bugs in `Arc::make_mut`)
 - #158928 (std: fix Xous UDP send_to length mismatch and truncation)
 - #159060 (Look for the cdb architecture that corresponds to the target triple)
 - #159089 (riscv: update c-variadic test for LLVM changes)
 - #159093 (pretty-print: use inline asm's actual macro name)
 - #159122 (doc: use ptr::addr in offset_from docs)

Failed merges:

 - #158732 (Apply MCP 1003 and move diagnostics.rs into its own module)

Rollup merge of #158928 - devnexen:xous_udp_fix, r=Mark-Simulacrum

std: fix Xous UDP send_to length mismatch and truncation

Cap the payload length to the buffer capacity so the declared length, bytes copied, and returned count agree, matching TcpStream::write.

std: fix Xous UDP recv length over-report and OOB panic

recv_inner returned the datagram length instead of the bytes copied into the caller's buffer, and rxlen >= 4075 could index past the receive buffer and panic. Clamp the count to both buffers, as in rust-lang#158928.

std: fix Xous UDP recv length over-report and OOB panic

recv_inner returned the datagram length instead of the bytes copied into the caller's buffer, and rxlen >= 4075 could index past the receive buffer and panic. Clamp the count to both buffers, as in rust-lang#158928.

std: fix Xous UDP recv length over-report and OOB panic

recv_inner returned the datagram length instead of the bytes copied into the caller's buffer, and rxlen >= 4075 could index past the receive buffer and panic. Clamp the count to both buffers, as in rust-lang#158928.

std: fix Xous UDP recv length over-report and OOB panic

recv_inner returned the datagram length instead of the bytes copied into the caller's buffer, and rxlen >= 4075 could index past the receive buffer and panic. Clamp the count to both buffers, as in rust-lang#158928.

Rollup merge of #159523 - devnexen:xous_upd_fix_2, r=Darksonn

std: fix Xous UDP recv length over-report and OOB panic

recv_inner returned the datagram length instead of the bytes copied into the caller's buffer, and rxlen >= 4075 could index past the receive buffer and panic. Clamp the count to both buffers, as in #158928.

std: fix Xous UDP recv length over-report and OOB panic

recv_inner returned the datagram length instead of the bytes copied into the caller's buffer, and rxlen >= 4075 could index past the receive buffer and panic. Clamp the count to both buffers, as in rust-lang/rust#158928.