|new []| better not overflow and crash with g++

[Florian Weimer]

* Georgi Guninski:

> once upon a time |calloc(BIG,BIG)| silently overflowed, now it is fixed.
>
> nowadays |new int[bignumber]| overflows as in:

This is PR19351, first reported in 2002 (along with the calloc issue).