[Fix][Relax] Canonicalize strided slice begin indices - #20284
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Summary
This fixes #20262 and #20263.
Currently,
strided_slicelowering can fail whenbeginfalls outside the input bounds. The output shape already canonicalizesbeginandendwhenassume_inbound=False, but the generated source index could still use the originalbeginvalue. This can produces the correct output shape while reading from the wrong location or outside the input tensor.This PR updates the affected lowering paths to use the existing
CanonicalizeIndexlogic when constructing source indices and handlesbegin == extentwith a negative stride, where the canonical start isextent - 1. Existingassume_inbound=Truelogic is unchanged.