[llvm-branch-commits] [clang] release/20.x: [Clang] Treat constexpr-unknown value as invalid in `EvaluateAsInitializer` (#128409) (PR #129836)

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llvmbot wrote:

@shafik What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/129836