fix: initialize the last 4 bytes of mem to zero
#149
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These last 4 bytes are, in fact, used for register `x0`, and must be zero. In multi-valued simulators, however, without an explicit init, these bytes start as undefined. Moving `x0` to anywhere results in those undefined bytes "infecting" other registers. Issue: olofk#148
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These last 4 bytes are, in fact, used for register
x0, and must be zero. In multi-valued simulators, however, without an explicit init, these bytes start as undefined. Movingx0to anywhere results in those undefined bytes "infecting" other registers.Issue: #148