[PATCH] D148728: [Support][Parallel] Add sequential mode to TaskGroup::spawn().

[Alexey Lapshin via Phabricator via llvm-commits]

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This patch allows to specify that some part of tasks should be
done in sequential order. It makes it possible to not use
condition operator for separating sequential tasks:

TaskGroup tg;
for () {

  if(condition)      ==>   tg.spawn(condition)
    tg.execute();
  else
    tg.spawn();

}

It also prevents execution on main thread. Which allows adding
checks for getThreadIndex() function discussed in D142318 <https://reviews.llvm.org/D142318>.

The patch also replaces std::stack with std::queue in the
ThreadPoolExecutor to have natural execution order in case
(parallel::strategy.ThreadsRequested == 1).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148728

Files:
  lld/ELF/OutputSections.cpp
  lld/ELF/Relocations.cpp
  llvm/include/llvm/Support/Parallel.h
  llvm/lib/Support/Parallel.cpp
  llvm/unittests/Support/ParallelTest.cpp

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