* elf-eh-frame.c (make_pc_relative): New function.
(_bfd_elf_write_section_eh_frame): Use it.
ld/testsuite/
* ld-mips-elf/eh-frame1-n32.d: Expect PC-relative encodings
to include DW_EH_PE_sdata4.
* ld-mips-elf/eh-frame2-n32.d: Likewise.
* ld-mips-elf/eh-frame1-n64.d: Expect PC-relative encodings
to include DW_EH_PE_sdata8.
* ld-mips-elf/eh-frame2-n64.d: Likewise.
* ld-mips-elf/eh-frame1-n32.d: Expect a warning about .eh_frame_hdr.
Remove duplicate CIEs. Adjust relocation addresses and .eh_frame
offsets accordingly. Do not allow there to be any trailing
R_MIPS_NONE relocations.
* ld-mips-elf/eh-frame1-n64.d: Likewise.
* ld-mips-elf/eh-frame2-n32.d: Likewise.
* ld-mips-elf/eh-frame2-n64.d: Likewise.
add_fde_encoding. Remove need_relative.
* elf-eh-frame.c (extra_augmentation_string_bytes)
(extra_augmentation_data_bytes, size_of_output_cie_fde): New functions.
(_bfd_elf_discard_section_eh_frame): Consider changing the FDE encoding
in cases where the CIE has no existing 'R' augmentation. Use
size_of_output_cie_fde when assigning offsets. Use the final offset
as the new section size.
(_bfd_elf_eh_frame_section_offset): Remove need_relative handling.
Account for any extra augmentation bytes in the returned offset.
(_bfd_elf_write_section_eh_frame): Rework so that the entries are
moved before being modified. Pad growing entries with DW_CFA_nops.
Add 'z' and 'R' augmentations as directed by add_augmentation_size
and add_fde_encoding.
