MIPS/GAS/testsuite: Print instructions in hex in division tests

Add `--show-raw-insn' to division tests so as to verify branch offsets
without the need to know actual offsets into the text section individual
instructions have been assembled at.  Add `-z' where applicable to make
interlock NOP instructions appear in output so as to verify them without
the need to know the offsets too.  Replace individual offsets to match
against with generic patterns so that a change in the expansion of an
assembly macro does not affect code that follows.