[BUG] Fix SPMM strided view
#2124
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cjnolet
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With the bug fix #2117 there can be an issue with
z_tmpmemory being uninitialized.SPMM formula is
Z = alpha . X * Y + beta . Zso whenbetais not zero, Z is being read.The proposed solution in this PR remove the need for an extra allocation and a copy from/to an external buffer, by creating a strided view of the original Z.