Bug 8407, post review cleanup: use instr::get_cont_dest() to get the instruction
continuation instruction, for CONTINUE exception handlers.


sql/sp_head.cc:
  Post review cleanup: use instr::get_cont_dest() to get the instruction
  continuation instruction, for CONTINUE exception handlers.
sql/sp_head.h:
  Post review cleanup: use instr::get_cont_dest() to get the instruction
  continuation instruction, for CONTINUE exception handlers.