[PATCH] D129111: [ELF] Optimize getInputSections. NFC

[Fangrui Song via Phabricator via llvm-commits]

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In the majority of cases (e.g. orphan sections), an OutputSection has at most
one InputSectionDescription. Allocating a vector is wasteful. Change the
return type to ArrayRef<InputSection *>. In the case of one InputSectionDescription,
reference the only isd->sections.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D129111

Files:
  lld/ELF/OutputSections.cpp
  lld/ELF/OutputSections.h
  lld/ELF/Writer.cpp

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