PR10687 Printing c++ class with static array (of same type) can produce infinite output

[Chris Moller]

Added yet another recursion detector (the third, so far as I noticed) to 
cp-valprint.c.  This one detects recursing static arrays which, although 
it comes unstuck in the same place as the 9067 recursing static structs, 
comes unstuck in a different way and thus needs a slightly different 
mechanism to detect.

No regressions.


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