[clang] [clang] Correct behavior of `LLVM_UNREACHABLE_OPTIMIZE=OFF` for `Release` builds (PR #68284)

[Arvind Mukund via cfe-commits]

MasterAwesome wrote:

@erichkeane @AaronBallman, I've added the release notes and rebased the change 
on `main`.


https://github.com/llvm/llvm-project/pull/68284
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