IntelPython / dpnp / 37066880482

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Fix multi-pass tree reductions and `matmul`, `vecdot` strides in reductions (#3082)

This PR fixes bugs in tree reductions, as well as a in `vecdot` for
strided outputs
* tree reductions which would take multiple passes over a row could,
with very large rows, produce incorrect results
* `vecdot` passed the strides of the second input as the strides of the
output
* A bug with GEMM kernels/`matmul` where intermediate reductions could
use the wrong strides

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