[PATCH] D101724: [lld-macho][nfc] De-templatize mach_header operations

[Jez Ng via Phabricator via llvm-commits]

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@thakis pointed out that `mach_header` and `mach_header_64`
actually have the same set of (used) fields, with the 64-bit version
having extra padding. So we can access the fields we need using the
single `mach_header` type instead of using templates to switch between
the two.

Addresses PR50180.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101724

Files:
  lld/MachO/Driver.cpp
  lld/MachO/InputFiles.cpp
  lld/MachO/InputFiles.h
  lld/MachO/SyntheticSections.cpp
  lld/MachO/SyntheticSections.h
  lld/MachO/Target.h
  lld/MachO/Writer.cpp
  lld/MachO/Writer.h

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