[SLP]Do not throttle nodes with split parents, if any of scalars is used in more than one split nodes If the the node to throttle is a vector node, which is used in split node, and at least one scalar of such a node is used in many split nodes, such vector node should be throttled. otherise there might be wrong def-use chain, which crashes the compiler. Fixes #175967 (cherry picked from commit c322a0c462b1b277e5862aeae2e95a40f7b130d4)
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