constants into PA instructions.
* Put #ifdefs around all signal handling code. Not generally
needed for embedded boards.
* (hppa_fix_call_dummy): Parameterize offsets into call dummy to
allow different dummys to be used by this code. Use
INSTRUCTION_SIZE instead of REGISTER_SIZE for things.
Conditionalize setup of _sr4export fixup. Improve comments.
* config/pa/tm-hppa.h: Define INSTRUCTION_SIZE. Use a different
call dummy if PA_LEVEL_0 is defined. Better comments for call
dummys. Define offsets for LDIL/LDO instructions which load
function addresses.
* config/pa/tm-pro.h: Get rid of signal handling stuff. Define
PA_LEVEL_0 to disable mucking with space regs and such.
