provide both TRAP and NOP values for our architectures, then change

provide both TRAP and NOP values for our architectures, then change
elf.sc to FILL .text segment with TRAP.  .init/.fini remain NOP FILL.

It is possible that some of these TRAP values aren't perfect yet, but
they can be changed.  When doing so also change the ld.script and gap.o
TRAP value.

discussions with mortimer, ok kettenis