cmd/internal/xcoff: move to x/debug/xcoff #29038
Since CL 149957, the tests inside gccgoimporter as long as the gccgo command is available, which is the case on most of AIX machines. However, it's only aware of ELF gccgo files, it doesn't recognize XCOFF files. To add the features, cmd/internal/xcoff must be moved to x/debug/xcoff as it was suggested by issue 28037.
Morever, big archive format is only available on AIX, as far as I know. Therefore, is that okay if I implement functions to read them in x/debug/xcoff ? Or I'd rather do a x/debug/ar as it was suggested here: