[Bug target/86131] powerpc: gcc uses costly multiply instead of shift left

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86131

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The cost has been 2 since the day -mcpu=860 was added back in 1996 (r0-10828).