[llvm-nm] Fix Bug 41353 - unique symbols printed as D instead of u
I'm new to LLVM and C++ so please do not hesitate to iterate with me on this fix.
Patch by Mike Pozulp!
Reviewers: rupprecht, zbrid, grimar, jhenderson
Reviewed By: rupprecht, jhenderson
Subscribers: jhenderson, chrisjackson, MaskRay, llvm-commits
Differential Revision: https://reviews.llvm.org/D61117