[llvm] [lldb] Add release note about ELF `thread siginfo` and negative SI Codes. (PR #141631)

[Jacob Lalonde via llvm-commits]

https://github.com/Jlalond created https://github.com/llvm/llvm-project/pull/141631

Adding a release note about adding `thread siginfo` support to `ThreadELFCore` and expanding Linux signals to understand user space signals.

>From b81ca613f74ee53c00c389e562f2d7d94a8fa6da Mon Sep 17 00:00:00 2001
From: Jacob Lalonde <jalalonde at fb.com>
Date: Tue, 27 May 2025 09:43:18 -0700
Subject: [PATCH] Make release note for thread siginfo changes and negative
 si_codes

---
 llvm/docs/ReleaseNotes.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/llvm/docs/ReleaseNotes.md b/llvm/docs/ReleaseNotes.md
index e590e54f2ccbf..1622e150d8433 100644
--- a/llvm/docs/ReleaseNotes.md
+++ b/llvm/docs/ReleaseNotes.md
@@ -279,6 +279,12 @@ Changes to LLDB
   supporting reverse execution, such as [rr](https://rr-project.org).
   When using reverse execution, `process continue --forward` returns to the
   forward execution.
+* LLDB now supports siginfo descriptions for user-space signals. User space
+  signals will now have descriptions describing the method and sender.
+  ```
+    stop reason = SIGSEGV: sent by tkill system call (sender pid=649752, uid=2667987)
+  ```
+* ELF Cores can now have their siginfo structures inspected using `thread siginfo`.
 
 ### Changes to lldb-dap