Fangrui Song b84d773fd0 [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

2024-09-20 21:15:42 -07:00

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