[llvm-branch-commits] [WIP] IR: Introduce !elf_section_properties for setting section properties. (PR #149260)

[Peter Collingbourne via llvm-branch-commits]

https://github.com/pcc created https://github.com/llvm/llvm-project/pull/149260

This new metadata type may be used to set sh_type and sh_entsize on a
global's section.

TODO:
- Add tests.