[LLVM-C] Expose the "Add Discriminators" Pass To LLVM-C
Summary: Add bindings to create a wrapped "Add Discriminators" pass. Now that we have debug info support, this is a handy transform to have.
Reviewers: whitequark, deadalnix
Reviewed By: whitequark
Subscribers: dblaikie, aprantl, hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D58624