buildSchedGraph() patch

[Jonas Paulsson via llvm-commits]

Hi Hal,

I have now once again rebased my patch for buildSchedGraph() and its 
handling of memory dependencies. It is available on phabricator: 
http://reviews.llvm.org/D8705.

Note that some PowerPC regressions occured. I managed to track down one 
of them and update the test, but not the other two. I am hoping that 
perhaps you could take a look.

I provide in this mail the patch for buildSchedGraph(), and also a patch 
that has one of the regression tests updated, and the other two removed.

Please take a look, test a lot and let me know... :-)

/Jonas


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