[all-commits] [llvm/llvm-project] cb03ac: [ELF] Move Symbol::needsTlsLd to config->needsTlsLd

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cb03ac0b5d6f5c46d453762b2f6e234c24eabe1e
      https://github.com/llvm/llvm-project/commit/cb03ac0b5d6f5c46d453762b2f6e234c24eabe1e
  Author: Fangrui Song <i at maskray.me>
  Date:   2022-02-07 (Mon, 07 Feb 2022)

  Changed paths:
    M lld/ELF/Config.h
    M lld/ELF/Relocations.cpp
    M lld/ELF/Symbols.h
    M lld/test/ELF/i386-tls-dynamic.s
    M lld/test/ELF/ppc64-tls-missing-gdld.s

  Log Message:
  -----------
  [ELF] Move Symbol::needsTlsLd to config->needsTlsLd

to decrease sizeof(SymbolUnion) from 72 to 64 on ELF64 platforms.

Use a dummy `Undefined` to prevent null pointer dereference (though unused)
`*rel.sym` in InputSectionBase::relocateAlloc.

The relocation order may shuffle a bit, but otherwise there is no behavior
difference.