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[Polly][MatMul] Abandon dependence analysis.
The copy statements inserted by the matrix-multiplication optimization introduce new dependencies between the copy statements and other statements. As a result, the DependenceInfo must be recomputed. Not recomputing them caused IslAstInfo to deduce that some loops are parallel but cause race conditions when accessing the packed arrays. As a result, matrix-matrix multiplication currently cannot be parallelized. Also see discussion at https://reviews.llvm.org/D125202
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