[PATCH] D90390: [yaml2obj] - Make `Section::Link` field to be `Optional<>`.

[George Rimar via Phabricator via llvm-commits]

grimar created this revision.
grimar added reviewers: jhenderson, MaskRay.
Herald added subscribers: rupprecht, hiraditya, emaste.
Herald added a reviewer: espindola.
Herald added a project: LLVM.
grimar requested review of this revision.

`Link` is not an optional field currently.
Because of this it is not convenient to write macros.

This makes it to be optional and fixes corresponding test cases.


https://reviews.llvm.org/D90390

Files:
  llvm/include/llvm/ObjectYAML/ELFYAML.h
  llvm/lib/ObjectYAML/ELFEmitter.cpp
  llvm/lib/ObjectYAML/ELFYAML.cpp
  llvm/test/tools/llvm-readobj/ELF/relr-relocs.test
  llvm/test/tools/obj2yaml/ELF/DWARF/debug-addr.yaml
  llvm/test/tools/obj2yaml/ELF/DWARF/debug-aranges.yaml
  llvm/test/tools/obj2yaml/ELF/DWARF/debug-ranges.yaml
  llvm/test/tools/obj2yaml/ELF/DWARF/debug-str.yaml
  llvm/test/tools/yaml2obj/ELF/dynsym-section.yaml
  llvm/tools/obj2yaml/elf2yaml.cpp

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