cost model debug printouts

[mppf]

a8499af changed src/analysis/costModel.cpp to turn off some debug printouts, but these seem to have reappeared in later revisions and are there in the current master branch.

Is it possible to add some sort of test to check RV is not released in this way? Or to make it an LLVM command line option?

[mppf]

The reason that I care about this is that I'm working on integrating RV with Chapel and the Chapel test suite will report failure if there is unexpected output. Besides which these printouts are probably not helpful to end users.

[simoll]

Issues like this one have been reappearing for a while.
We are planning to move to automatic testing, CI as we are maturing RV development from pure 'academic' style to a more product-like approach.