For all of the following reductions:
vector.reduce.or
vector.reduce.and
vector.reduce.xor
vector.reduce.add
vector.reduce.mul
vector.reduce.umin
vector.reduce.umax
vector.reduce.smin
vector.reduce.smax
vector.reduce.fmin
vector.reduce.fmax
if the input operand is the result of a vector.reverse then we can
perform a reduction on the vector.reverse input instead since the answer
is the same. If the reassociation is permitted we can also do the same
folds for these:
vector.reduce.fadd
vector.reduce.fmul
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