From: Richard Henderson <richard.henderson@linaro.org>
Not adjusting La_aarch64_regs or La_aarch64_retval for the new AdvSIMD
vector ABI; that will require more thought and coordination. In the
meantime, this will at least pass the proper values to each callee,
even if the values are not visible to auditing.
* sysdeps/aarch64/dl-trampoline.S (_dl_runtime_profile):
Do not record unwind info for arguments -- this is unneeded;
properly include the 16 bytes of PLT stack into the unwind;
save and restore the structure return pointer, x8;
save all of the AdvSIMD registers defined for the vector ABI.