invoke.texi (Optimize Options): Under -fcse-follow-jumps, show that CSE means common subexpression elimination.

	* doc/invoke.texi (Optimize Options): Under -fcse-follow-jumps,
	show that CSE means common subexpression elimination.  Change wording
	for -fsee and define LCM.  Remove capitalization of optimizations
	for -ftree-reassoc, -ftree-pre, and -ftree-fre.

From-SVN: r129824