Add back ppc input/output/clobber definitions
Add back ppc input/output/clobber definitions

Accidentally removed when rebasing, this adds it back.

zig-lang/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,andrewrk/zig