[PATCH] D34288: [COFF] Drop unused comdat sections when GC is turned off

[Reid Kleckner via Phabricator via llvm-commits]

rnk created this revision.

Adds a "Discarded" bool to SectionChunk to indicate if the section was
discarded by COMDAT deduplication. The Writer still just checks
`isLive()`.

Fixes PR33446


https://reviews.llvm.org/D34288

Files:
  lld/COFF/Chunks.cpp
  lld/COFF/Chunks.h
  lld/COFF/InputFiles.cpp
  lld/COFF/SymbolTable.cpp
  lld/test/COFF/Inputs/associative-comdat-2.s
  lld/test/COFF/associative-comdat.s

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