[PATCH] Add a new pass to compute DWARF path discriminators.

[Eric Christopher]

  I think you're calling it with bad arguments - the Scope for a lexical block should never be NULL. You could probably just assert that in the DIBuilder. Look for the call to getNonCompileUnitScope - it's likely there that you're running into problems.

  A small patch to add the assert at the right place for creating a lexical block should probably work as well.

http://llvm-reviews.chandlerc.com/D2691