i386.c: make "sorry" message more amenable to translation (PR target/79926)

i386.c: make "sorry" message more amenable to translation (PR target/79926)

gcc/ChangeLog:
	PR target/79926
	* config/i386/i386.c (ix86_set_current_function): Make "sorry"
	messages more amenable to translation, and improve wording.

gcc/testsuite/ChangeLog:
	PR target/79926
	* gcc.target/i386/interrupt-387-err-1.c: Update expected message.
	* gcc.target/i386/interrupt-387-err-2.c: Likewise.
	* gcc.target/i386/interrupt-mmx-err-1.c: Likewise.
	* gcc.target/i386/interrupt-mmx-err-2.c: Likewise.

From-SVN: r269515