[LLVMGPUVectorDistribute] Refactor vector.contract distribute #19631
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Currently, vector.contract distribution is implemented as a standalone distribution closely following vector.multi_reduce. Therefore, we have to duplicate code/effort when we improve either one.
This commit changes vector.contract just to distribute the "contract" part of it. Then it creates a new vector.multi_reduce to be re-distributed with partial reduction semantics. Thus, allowing the improvements of vector.multi_reduce to be re-used by vector.contract
closes : #19620