[clang] [clang][ReleaseNotes] document -fstack-clash-protection for Android (PR #223786)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Nick Desaulniers (nickdesaulniers)

<details>
<summary>Changes</summary>

Link: #<!-- -->209279


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Full diff: https://github.com/llvm/llvm-project/pull/223786.diff


1 Files Affected:

- (modified) clang/docs/ReleaseNotes.md (+4) 


``````````diff
diff --git a/clang/docs/ReleaseNotes.md b/clang/docs/ReleaseNotes.md
index f37bcda179c95..113d7d97ef166 100644
--- a/clang/docs/ReleaseNotes.md
+++ b/clang/docs/ReleaseNotes.md
@@ -111,6 +111,10 @@ features cannot lower the translation-unit ABI level;
 
 - Templight support has been removed.
 
+- `-fstack-clash-protection` has been enabled implicitly by default for android
+  target triples (except 32b arm targets). Can be disabled via
+  `-fno-stack-clash-protection`.
+
 ### Clang Python Bindings Potentially Breaking Changes
 
 - `CompletionChunkKind` instance's `__str__` representation has been adapted to be consistent with other enums in the library.

``````````

</details>


https://github.com/llvm/llvm-project/pull/223786