[Bug ld/31179] RISC-V: The SET/ADD/SUB fix breaks ABI compatibility with 2.41 objects

[nelsonc1225 at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31179

--- Comment #8 from Nelson Chu <nelsonc1225 at sourceware dot org> ---
Created attachment 15270
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15270&action=edit
proposed solution with the tag to keep compatible

Updated to have a tag, this patch should be applied after the proposed v1
patch.

The object which marked by the tag means it won't have any non-zero ddend in
SUB_ULEB128 from .uleb128 directives, so we don't need to ignore them to get
the
correct calculation in linker.

Since the tag is non-standard in riscv psabi, so need use
elf_other_obj_attributes_proc rather than elf_known_obj_attributes_proc api to
access.

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