m32r.h (CONDITIONAL_REGISTER_USAGE): Don't exclude fixed registers form
  all_used_regs. Update call_really_used_regs.
  (CALL_REALLY_USED_REGISTERS): Define.
m32r.c (MUST_SAVE_REGISTER): Replace call_used_regs with call_really_used_regs.

From-SVN: r88737