SVE is starting to appear on aarch64. There are a few enhancements needed within elfutils's DWARF support needed to support SVE. These changes are outlined here: https://static.docs.arm.com/100985/0000/abi_sve_aadwarf_100985_0000_00_en.pdf In particular it the Z registers aren't yet described in backends/aarch64_regs.c and neither is the Vector granule pseudo register.
These are now described here: https://github.com/ARM-software/abi-aa/blob/main/aadwarf64/aadwarf64.rst