Rollup merge of #119068 - sksat:copy-1.74.1-release-note-to-master, r…

…=Mark-Simulacrum

Copy 1.74.1 release notes to master

- #119065
- this cherry-pick 1.74.1 release note from #118607(66033ec)

Fixes #119065.

RELEASES.md

@@ -1,3 +1,10 @@
+Version 1.74.1 (2023-12-07)
+===========================
+
+- [Resolved spurious STATUS_ACCESS_VIOLATIONs in LLVM](https://github.com/rust-lang/rust/pull/118464)
+- [Clarify guarantees for std::mem::discriminant](https://github.com/rust-lang/rust/pull/118006)
+- [Fix some subtyping-related regressions](https://github.com/rust-lang/rust/pull/116415)
+
 Version 1.74.0 (2023-11-16)
 ==========================