[llvm-branch-commits] [clang] release/23.x: [NFC][clang][Serialization] Fix std::set_difference sorting mismatch in ASTReader (#219053) (PR #219097)

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llvmbot wrote:

@ChuanqiXu9 What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/219097