[llvm] [llvm][support] Show name of overlapping cl option (PR #70108)

[Maksim Levental via llvm-commits]

makslevental wrote:

> instead which will actually print out the name

D'oh - I knew there must be some reason it wasn't parameterized in the first place but couldn't figure out exactly why. Okay I'll try with the `#ifndef` (and I'll split out the formatting).

https://github.com/llvm/llvm-project/pull/70108