Paul Kirth b146a57f67 Reapply "[RISCV] Support RISCV Atomics ABI attributes (#84597)" ...

This patch adds support for the atomic_abi attribute, specifid in
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc#tag_riscv_atomic_abi-14-uleb128version.

This was previously reverted due to ld.bfd segfaulting w/ unknown riscv
attributes. Attribute emission is now guarded by a backend flag
`--riscv-abi-attributes`, which is off by default. Linker support in
LLD for attribute merging is now in a standalone patch.

Reviewers: kito-cheng, MaskRay, asb

Reviewed By: MaskRay

Pull Request: https://github.com/llvm/llvm-project/pull/90266

2024-07-02 08:23:03 -07:00

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