[clang] [C++20][Modules][Serialization] Delay marking pending incomplete decl chains until the end of `finishPendingActions`. (PR #121245)

[Michael Park via cfe-commits]

mpark wrote:

/cherry-pick a9e249f64e800fbb20a3b26c0cfb68c1a1aee5e1

https://github.com/llvm/llvm-project/pull/121245
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