h8300-protos.h: Add a prototype for h8300_current_function_interrupt_function_p.
* config/h8300/h8300-protos.h: Add a prototype for
h8300_current_function_interrupt_function_p.
* config/h8300/h8300.c (interrupt_handler): Remove.
(os_task): Likewise.
(monitor): Likewise.
(pragma_interrupt): New.
(WORD_REG_USED): Use
h8300_current_function_interrupt_function_p.
(dosize): Likewise.
(h8300_output_function_prologue): Likewise.
Do not set interrupt_handler, os_task, monitor.
(h8300_output_function_prologue): Use
h8300_current_function_interrupt_function_p.
Do not set interrupt_handler, os_task, monitor.
(h8300_current_function_interrupt_function_p): New.
(h8300_pr_interrupt): Set pragma_interrupt.
(h8300_insert_attributes): Reset pragma_interrupt.