[PATCH] Add a speculative execution pass

[Owen Anderson]

> On May 14, 2015, at 11:41 AM, hfinkel at anl.gov wrote:
> 
> 1. Don't put it in the standard pipeline (assuming that GPU-compilers have their own pipelines anyway and will use it in those custom pipelines only).

In our experience, this is generally already the case.  The default pipeline isn’t particularly well tuned for GPUs.

—Owen
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