(struct save_state): Add fields for floating point registers,
FPSCR and FPUL.
(sim_resume): Add 'F' for accessing floating point registers
in the save state structure.
* gencode.c: Add sh3e opcodes.
(gensym): Define a buffer for int<->fp conversions.
First cut at simulating sh3e instructions. Basic stuff should work;
instructions using fpul and fpscr are completely untested... Sanitized
away for now (sh3e).
([r|w][bwl]at[little|big]) New functions.
(sim_resume): If GO32 check for interrupt every now
and again. Decrement PC if SIGBUS seen.
* run.c (main): Return result of simulated _exit.
