bcopy.S is no longer needed
memmove and memcpy were both stacking r0 and unstacking it to keep the return value, so push this down into _memcpy.
rename _memcpy.S to memcpy.S.
memmove.S is now just a placeholder otherwise the make system automagically adds a memmove.c file to libkern.
memmove is just another entry point for memcpy.
them.
These are identical to the current arm32 sources with the following exceptions:
- References to C labels are wrapped in _C_LABEL().
- Function returns have an alternate version inside #ifdef __APCS_26__.