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[mlir] Add a new context flag for disabling/enabling multi-threading

Authored by rriddle on May 2 2020, 12:28 PM.

Description

[mlir] Add a new context flag for disabling/enabling multi-threading

This is useful for several reasons:

  • In some situations the user can guarantee that thread-safety isn't necessary and don't want to pay the cost of synchronization, e.g., when parsing a very large module.
  • For things like logging threading is not desirable as the output is not guaranteed to be in stable order.

This flag also subsumes the pass manager flag for multi-threading.

Differential Revision: https://reviews.llvm.org/D79266