SCEV simplifying the subtraction may result in redundant compares that
are all OR'd together. Keep track of the generated operands in
SeenCompares, with the key being the pair of operands for the compare.
If we alrady generated the same compare previously, skip it.
Instead of expanding the src/sink SCEV expressions and emitting an IR
sub to compute the difference, the subtraction can be directly be
performed by ScalarEvolution. This allows the subtraction to be
simplified by SCEV, which in turn can reduced the number of redundant
runtime check instructions generated.
It also allows to generate checks that are invariant w.r.t. an outer
loop, if he inner loop AddRecs have the same outer loop AddRec as start.
