[all-commits] [llvm/llvm-project] 453092: [clang] fix serialization for SubstNonTypeTemplate...

[Matheus Izvekov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4530922cfdacc5be25dbe499fc106cc3b009bf79
      https://github.com/llvm/llvm-project/commit/4530922cfdacc5be25dbe499fc106cc3b009bf79
  Author: Matheus Izvekov <mizvekov at gmail.com>
  Date:   2025-04-11 (Fri, 11 Apr 2025)

  Changed paths:
    M clang/lib/Serialization/ASTReaderStmt.cpp
    M clang/lib/Serialization/ASTWriterStmt.cpp

  Log Message:
  -----------
  [clang] fix serialization for SubstNonTypeTemplateParmPackExpr (#135428)

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.



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