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Rule out overflowing signed divisions

Ben Gamari requested to merge ci into master

Consider a signed division such as (-128::W8) / (-1::W8). GHC lowers this to IDIV which will throw an FP exception since the 8-bit target register is too small to accommodate the result, 128.

Therefore, we are going to specify the Quot primop as being undefined in cases where the result overflows.

Fixes #1 (closed).

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