[P2] mret instruction corrupts x0 register about rev HOT 4 CLOSED

we have a temporary fix in place where we hammer x0 to zero after the instruction executes in adb62a9

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This temp fix can address x0 corruption but this will not resolve other memory or register corruption issues.

As for now I'm tracking other bug where memory gets corrupted when ret/jalr is executed and looks very similar to this report but corruption comes from other place.

from rev.

One more note - mret instruction was decoded as lui - which should not happen.

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mret is not currently supported in Rev

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