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[Parallel] Revert sequential task changes
https://reviews.llvm.org/D148728 introduced `bool Sequential` to unify
`execute` and the old `spawn` without argument. However, sequential
tasks might be executed by any worker thread (non-deterministic),
leading to non-determinism output for ld.lld -z nocombreloc (see
https://reviews.llvm.org/D133003).
In addition, the extra member variables have overhead.
This sequential task has only been used for lld parallel relocation
scanning.
This patch restores the behavior before https://reviews.llvm.org/D148728 .
Fix #105958
Pull Request: https://github.com/llvm/llvm-project/pull/109084
This fixes the non-reproducibility we had noticed when linking our EFI
loaders, and for which we committed a workaround in
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llvm | ||
openmp | ||
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