875ee0ed1c
This is a followup to D128847. The `AffineMap::getPermutedPosition` method performs a linear scan of the map, thus the previous implementation had asymptotic complexity of `O(|topSort| * |m|)`. This change reduces that to `O(|topSort| + |m|)`. Reviewed By: aartbik Differential Revision: https://reviews.llvm.org/D129011