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Check for overflow in $GENERATE computations [v9_18]

Mark Andrews requested to merge 3429-detect-overflow-in-generate-directive-v9_18 into v9_18

$GENERATE uses 'int' for its computations and some constructions can overflow values that can be represented by an 'int' resulting in undefined behaviour. Detect these conditions and return a range error.

(cherry picked from commit 5327b970)

Closes #3429 (closed)

Edited by Mark Andrews

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