[clang] [Clang] Add release note for pointer overflow optimization change (PR #122462)

[Hans Wennborg via cfe-commits]

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@@ -58,6 +58,26 @@ code bases.
   containing strict-aliasing violations. The new default behavior can be
   disabled using ``-fno-pointer-tbaa``.
 
+- Clang will now more aggressively use undefined behavior on pointer addition
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zmodem wrote:

Fair enough.

https://github.com/llvm/llvm-project/pull/122462