joerg added a comment.

Looking again at the failure mode, I think the best approach is to go back to 
the original test case and just select a fixed target. The problematic IR 
difference is purely an ABI choice of the target and not even related to 
-fsigned-char vs -funsigned-char. As such, the extensive use of regular 
expressions just makes the test case harder to read and maintain.


http://reviews.llvm.org/D19062



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