[Clp] Turning off array bounds checking in the COIN library?

[Robin Whittle]

Some time ago I recall reading - perhaps on this list - that the code
which is in the CLP library, or perhaps which the CLP library uses in
the COIN library, is by default compiled with arrangements which trap
any access to arrays beyond the bounds of these arrays.

"Bounds checking" is the term often used for such a facility, but
searching the source for this doesn't help since the word is frequently
used to refer to LP bounds.

Can someone point me to such a facility?  I assume it could be turned
off to improve performance.

Robin