[PATCH] D121053: [lld-macho] Deduplicate the `__objc_classrefs` section contents

[Jez Ng via Phabricator via llvm-commits]

int3 created this revision.
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ld64 breaks down `__objc_classrefs` on a per-word level and deduplicates
them. This greatly reduces the number of bind entries emitted (and
therefore the amount of work `dyld` has to do at runtime). For
chromium_framework, this change to LLD cuts the number of (non-lazy)
binds from 912 to 190, getting us to parity with ld64 in this aspect.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121053

Files:
  lld/MachO/ICF.cpp
  lld/MachO/InputFiles.cpp
  lld/MachO/InputSection.cpp
  lld/MachO/InputSection.h
  lld/test/MachO/objc-classrefs-dedup.s

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