[PATCH] D126793: [ELF] Remove support for legacy .zdebug sections

[Fangrui Song via Phabricator via llvm-commits]

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.zdebug is unlikely used any longer: gcc -gz switched from legacy
.zdebug to SHF_COMPRESSED with binutils 2.26 (2016), which has been
several years. clang 14 dropped -gz=zlib-gnu support. According to
Debian Code Search (`gz=zlib-gnu`), no project uses -gz=zlib-gnu.

Remove .zdebug support to (a) simplify code and (b) allow removal of llvm-mc's
--compress-debug-sections=zlib-gnu.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126793

Files:
  lld/ELF/InputSection.cpp
  lld/ELF/InputSection.h
  lld/docs/ReleaseNotes.rst
  lld/test/ELF/compressed-debug-input.s
  lld/test/ELF/relocatable-compressed-input.s
  lld/test/ELF/strip-debug.s

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