Fix optimisation of xor on identical operands. #1832
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Currently: ``` %0: i8 = ... %1: i8 = xor %0, %0 ``` is optimised to: ``` %1: i1 = 0i1 ``` i.e. the type is always i1, which isn't right.
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Currently:
is optimised to:
i.e. the type is always i1, which isn't right.
(this fixes one problem with ykjit/yklua#129, but looks like there may be one more)