alpha.c, [...]: Revert the replacements of "FALLTHRU" with "Fall through" done in...

alpha.c, [...]: Revert the replacements of "FALLTHRU" with "Fall through" done in the previous...

	* config/alpha/alpha.c, config/arc/arc.c, config/avr/avr.c,
	config/i386/i386.c, config/i386/i386.h, config/i386/i386.md,
	config/ia64/ia64.c, config/ia64/unwind-ia64.c,
	config/m32r/m32r.c, config/ns32k/ns32k.c, config/pa/pa.c,
	config/pdp11/pdp11.c, config/rs6000/rs6000.c,
	config/sparc/sparc.c, config/vax/vax.c: Revert the
	replacements of "FALLTHRU" with "Fall through" done in the
	previous patch.

From-SVN: r77269