[lld] [LLD]Discard invalid "DW.ref.__gxx_personality_v0" pieces in rela.eh_frame (PR #158590)

[Peter Smith via llvm-commits]

https://github.com/smithp35 commented:

Can you confirm that this is something that you've observed in the relocations for `--emit-relocs`  and not a problem that you've observed when writing the .eh_frame in an executable or shared-library?

When I worked on .ARM.exidx sections many years ago, we had a discussion about a similar problem with emit-relocs and the outcome was that complete emit-relocs was not that important so just don't emit the relocation section for it https://github.com/llvm/llvm-project/blob/main/lld/ELF/SyntheticSections.cpp#L4092 

I mention this as there may be a better way of solving this problem. For example could we choose to not emit the relocations section for .eh_frame or construct it specially rather than trying to post-process it post-hoc.

Whatever the result of the discussion, please can you add a test?

https://github.com/llvm/llvm-project/pull/158590