[PATCH] D87909: [lld-macho] Support absolute symbols

[Jez Ng via Phabricator via llvm-commits]

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They operate like Defined symbols but with no associated InputSection.

Note that `ld64` seems to treat the weak definition flag like a no-op for
absolute symbols, so I have replicated that behavior.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87909

Files:
  lld/MachO/ExportTrie.cpp
  lld/MachO/InputFiles.cpp
  lld/MachO/InputFiles.h
  lld/MachO/SymbolTable.cpp
  lld/MachO/Symbols.cpp
  lld/MachO/Symbols.h
  lld/MachO/SyntheticSections.cpp
  lld/test/MachO/abs-symbols.s
  lld/test/MachO/invalid/abs-duplicate.s
  lld/test/MachO/invalid/dso-handle-duplicate.s

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