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2019-04-29fix folding of unsigned operationsQuentin Carbonneaux
This fixes similar bugs than the ones fixed in the previous commit. In the folding code the invariant is that when a result is 32 bits wide, the low 32 bits of 'x' are correct. The high bits can be anything.
2019-04-29fold: Make sure 32-bit constants get sign extended when necessaryMichael Forney