Reland "[lld-macho] Fix assertion failure in registerCompactUnwind""

Reland "[lld-macho] Fix assertion failure in registerCompactUnwind""

PR/52372

  Differential Revision: https://reviews.llvm.org/D112977

New changes:
- use llvm-otool instead of `otool` which doesn't in exist on non-OSX platforms
- add llvm-otool to the set of tools used by test so that the bot will use the <build_dir>/bin/llvm-otool instead of the unqualified `llvm-otool` (which may not exist)
- update tests since the latest (TOT) llvm-otool prints a space between two bytes and the old one doesn't.