[wwwdocs] changes-4.5: Add "(experimental)" to -fwhopr, EH cleanup and redirection

[Tobias Burnus]

Honza pointed out that advertising -fwhopr is a bad idea as it is not
yet well working. -fwhopr only occurs once in the 4.5 changes; I propose
the following change:

   "combine -flto and -fwhopr  with -fwhole-program"
to "combine -flto [and -fwhopr (experimental)]  with -fwhole-program"

(I have also updated the links, again, - one should really link to the
4.5 documentation, but onlinedocs/4.5 does not exist, yet.)

Additionally, I added an item for eh cleanup and redirection, using what
Honza posted at #gcc.

OK? Better suggestions?

Tobias
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