[doc, committed] fix typos in docs/comments for devirtualization optimizations

[Sandra Loosemore]

I noticed a number of typos in the documentation for the 
devirtualization optimization options in invoke.texi, also in the short 
option description in common.opt.  When I was browsing the code to make 
sure I understood the purpose of these options, I noticed that there 
were very many more typos in the comments in ipa-devirt.c.  I've made a 
pass through everything to clean things up and checked in this patch 
under the "obvious fix" rule.

There were a couple things I didn't address here:

* I suggest renaming the function type_known_to_have_no_deriavations_p 
to type_known_to_have_no_derivations_p.  (I suppose such a code change 
requires a complete bootstrap and regression test....  I'm lazy....)

* I noticed the comments documenting possible_polymorphic_call_targets 
appear to be describing parameters and behavior that aren't there any 
more.  I'll leave fixing that up to somebody who has a deeper 
understanding of the code.

-Sandra

2015-01-02  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/invoke.texi (Option Summary): Fix spelling of
	-fdevirtualize-at-ltrans.
	([-fdevirtualize]): Fix markup.
	([-fdevirtualize-speculatively]): Fix typo.
	([-fdevirtualize-at-ltrans]): Likewise.  Make description less
	implementor-speaky.
	* common.opt (fdevirtualize-at-ltrans): Likewise.
	* ipa-devirt.c: Fix typos in comments throughout the file.
	(ipa_devirt): Fix typos in format strings for dump output.

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