Patch to check for Integer overflow in presence of casts.

[jahanian]

Currently we do not warn Integer overflow in presence of casts; as in:
unsigned long long l = 65536 * 65536;

This small patch fixes it:



Also, is there a reason we do not warn on overflow for unsigned; as in:
unsigned long long l2 = 65536 * (unsigned)65536;
Even though resulting constant is the unexpected 0.

- Please review and comment.

- Thanks, Fariborz

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