[PATCH] D130125: [lld-macho] Fold __objc_imageinfo sections

[Jez Ng via Phabricator via llvm-commits]

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Previously, we treated it as a regular ConcatInputSection. However, ld64
actually parses its contents and uses that to synthesize a single image
info struct, generating one 8-byte section instead of `8 * number of
object files`.

I'm not entirely sure what impact this section has on the runtime, so I
just tried to follow ld64's semantics as closely as possible in this
diff. My main motivation though was to reduce binary size.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130125

Files:
  lld/MachO/Driver.cpp
  lld/MachO/SyntheticSections.cpp
  lld/MachO/SyntheticSections.h
  lld/MachO/Writer.cpp
  lld/test/MachO/objc-imageinfo.s

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