[wide-int] small cleanup in wide-int.*

[Kenneth Zadeck]

This patch does three things in wide-int:

1) it cleans up some comments.
2) removes a small amount of trash.
3) it changes the max size of the wide int from being 4x of 
MAX_BITSIZE_MODE_ANY_INT to 2x +1.   This should improve large muls and 
divs as well as perhaps help with some cache behavior.

ok to commit
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