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95b638f613
musl and glibc both specify r0 as an output register because its value may be overwritten by system calls. As with the updates for 64-bit PowerPC in the previous commit, this commit brings Zig's syscall functions for 32-bit PowerPC in line with musl and glibc by adding r0 to the list of clobbers. (Listing r0 as both an input and a clobber is as close as we can get to musl, which declares it as a "+r" read-write output, since Zig doesn't support multiple outputs or the "+" specifier.)