[PATCH] D88652: [yaml2obj][elf2yaml] - Add a support for the `EntSize` field for `SHT_HASH` sections.

[George Rimar via Phabricator via llvm-commits]

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

Specification for SHT_HASH table says (https://refspecs.linuxbase.org/elf/gabi4+/ch5.dynamic.html#hash)
that it contains Elf32_Word entries for both 32/64 bit objects.

Currently both GNU linkers and LLD sets the `sh_entsize` field to `4`.

At the same time, `yaml2obj` ignores the `EntSize` field for SHT_HASH sections.
This patch fixes this and also adds a support for obj2yaml: it will not
dump this field when the `sh_entsize` contains the default value (`4`).


https://reviews.llvm.org/D88652

Files:
  llvm/lib/ObjectYAML/ELFEmitter.cpp
  llvm/test/tools/obj2yaml/ELF/hash-section.yaml
  llvm/test/tools/yaml2obj/ELF/hash-section.yaml
  llvm/test/tools/yaml2obj/ELF/section-headers-exclude.yaml
  llvm/tools/obj2yaml/elf2yaml.cpp

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