Due to _elfN(x) only having a distinction between 32 and 64 bit (meaning we can only have one load endianness in a given loader binary), and the requirement that we need to build a 32 bit big-endian loader that can load 64-bit little-endian kernels, teach stand/common/load_elf.c how to do a cross-endian load.
This hasn't been proven to work correctly (kernel currently crashes, but after banner. I need to reverify with my old load procedure that the kernel is still okay on pseries.)