Namely, only "symbolize" platform and tool names if `-v` is passed.
(`llvm-otool -lv` output still isn't quite the same as `otool -lv` output, but
`-v` output is arguably for consumption by humans, so I'm not changing that
at this point. Someone else could change it if it was important to them.)
Differential Revision: https://reviews.llvm.org/D124920