llvm-objdump takes foo-bar style flags, while llvm-otool takes foo_bar style
flags. dyld_info was the only exception to that.
Add a -dyld_info flag to llvm-otool instead.
(Both in llvm-objdump and llvm-otool, the flag doesn't really do anything
yet.)
Differential Revision: https://reviews.llvm.org/D131897
1642667392