4530922cfd
This fixes a PCM non-determinism regression reported here: https://github.com/llvm/llvm-project/pull/134560#issuecomment-2797744370 There was a bit in `SubstNonTypeTemplateParmPackExpr` which we missed to serialize, and that bit eventually propagates to `SubstNonTypeTemplateParmExpr`. As a drive by, improve serialization for PackIndex on SubstNonTypeTemplateParmExpr by using the newly introduced UnsignedOrNone helpers. There are no release notes since this regression was never released.
The LLVM Compiler Infrastructure
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