[PATCH] D103489: [lld-macho][nfc] Remove unnecessary use of Optional<T*>

[Vy Nguyen via Phabricator via llvm-commits]

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In all of these cases, the functions could simply return a nullptr instead of {}.
There is no case where Optional<nullptr> has a special meaning.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103489

Files:
  lld/MachO/Driver.cpp
  lld/MachO/Driver.h
  lld/MachO/DriverUtils.cpp
  lld/MachO/InputFiles.cpp

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