[PATCH] Replace Mutex with RWMutex in PassRegistry

[Chad Rosier]

Committed revision 185566.  Thanks, Alex.

On Jul 3, 2013, at 9:41 AM, Alex Crichton <alex at crichton.co> wrote:

> I emailed last week
> (http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130624/179287.html)
> about replace a mutex with an rwmutex to greatly reduce contention in
> the test cases I found, but I forgot to mention that I don't have
> committer's rights and would need someone to commit this for me.
> 
> The change was approved by Chris Lattner in the other thread, but if
> someone could commit this for me, that would be great!
> 
> Thanks,
> Alex
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