Don't warn about overflows on const values

[milancermak]

If possible, it would be great to avoid false positives when detecting potential overflows like this one on the screenshot

It's clear that 8000 * 5 is a constant value that fits inside a felt, there's no overflow hazard.

Here's a gif of a dachshund kissing a lion for no particular reason

[fcasal]

As always, thanks for the rule improvement suggestions!