[PATCH] Remove support for runtime multithreading

[Chandler Carruth]

On Fri, Jun 13, 2014 at 11:01 PM, Zachary Turner <zturner at google.com> wrote:

> I tried this once and ran into some difficulty, because before this
> change, the Mutex is a pointer which null is an expected value if
> llvm_start_multithreaded has not been called.  So the function would have
> to return a pointer to the mutex.  That would require changing MutexGuard
> to take a pointer instead of a reference, which would generate a ton of
> churn.
>
> I'll have another stab at it and see if there's a way to do it in a way
> that has very little churn and still contributes to this change as well.
>

I would make there always be a mutex as you do in this change? Is there
some reason that dosen't work? I'm not worried about these being no-ops
when multithreading is disabled as long as they're correct.
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