* c-typeck.c, config/arm/arm.c, config/darwin.c,
	config/sh/symbian.c, gcc.c, ipa-cp.c, ipa-inline.c, loop-iv.c,
	omega.c, tree-ssa-loop-niter.c, treestruct.def: Fix typos and
	follow spelling conventions in various
	warning/error/diagnostic messages.

From-SVN: r125089