[SLP] Add detection of shuffled/perfect matching of tree entries.
SLP supports perfect diamond matching for the vectorized tree entries but do not support it for gathered entries and does not support non-perfect (shuffled) matching with 1 or 2 tree entries. Patch adds support for this matching to improve cost of the vectorized tree. Reviewed By: RKSimon Differential Revision: https://reviews.llvm.org/D100495
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