[Bug target/63596] Saving of GPR/FPRs for stdarg even though the variable argument is not used

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63596

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jiong Wang from comment #2)
> we are also lack of initialization for va_list_gpr_counter_field and
> va_list_vpr_counter_field, thus currently the whole tree-stdarg optimization
> doesn't work for AArch64, and lots of other targets, like arm, sparc, mips
> etc are lack of this vaarg opt tuning also.

Yes but the two other server targets (x86 and PowerPC) don't lack this
optimization.