[Bug target/84762] GCC for PowerPC32 violates the SysV ABI spec for small struct returns

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84762

--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The problem in trunk happens at expand time already: it loads the 32-bit word
it created from stack, and then shifts it left by -8 bits.