[Bug target/64580] very high rs6000_stack_info() usage during LTO Firefox build on ppc64

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64580

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Hi Segher,

on gcc112 you can use the following command to reproduce the issue:

 % g++ -xlto -c -mcpu=power8 -O3 -fPIC -fno-exceptions -fltrans -o /dev/null
/var/tmp/libxul.so.ltrans8.o