Use pc-relative relocations in .eh_frame. R_MIPS_PC32 relocation is generated in 32-bit case. R_MIPS_PC32 | R_MIPS_64 relocation chain is generated in 64-bit case for all code model.
With this change object files can be linked by LLD without having to pass -Wl,-z,notext options.
Now this patch is rather "proof-of-concept". Not a commit ready changes. Any comments are welcome.