[PATCH] Add a new utility script that helps update very simple regression tests.

[Chandler Carruth]

FYI, I'm now bringing up using this script in code reviews. I would really appreciate some review of it. At the least I'd like some acknowledgement that it can be committed in the (quite shoddy) form that it is so that folks can benefit from using it.


http://reviews.llvm.org/D5546

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