[Cherry-pick][clang] Correct behavior of `LLVM_UNREACHABLE_OPTIMIZE=OFF` for `Release` builds#154

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MasterAwesome wants to merge 1 commit intorust-lang:rustc/17.0-2023-09-19from MasterAwesome:rustc/17.0-2023-09-19

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Commits on Oct 5, 2023

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