IVF-PQ coarse search: fix integer overflow #999
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When the IVF-PQ batch size and the number of cluster are big enough, the GEMM output matrix size may exceed the
uint32_tlimits. This manifests as an illegal memory access popping up in further stages of IVF-PQ (due to everything being as async as possible).This PR fixes the bug by converting the input arguments to 64-bits before multiplying them.