message: [MLIR] Reenable materialize_vectors test
  Fixes one of the Filecheck'ed test which was mistakenly disabled.
diff: // RUN: mlir-opt %s -vectorize -virtual-vector-size 32 --test-fastest-varying=0 -materialize-vectors -vector-size=8 | FileCheck %s -check-prefix=VEC1DTO1D
  // RUN: mlir-opt %s -vectorize -virtual-vector-size 3 -virtual-vector-size 16 --test-fastest-varying=1 --test-fastest-varying=0 -materialize-vectors -vector-size=8 | FileCheck %s -check-prefix=VEC2DTO1D
  -// RUN_: mlir-opt %s -vectorize -virtual-vector-size 3 -virtual-vector-size 32 --test-fastest-varying=1 --test-fastest-varying=0 -materialize-vectors -vector-size=3 -vector-size=16 | FileCheck %s -check-prefix=VEC2DTO2D
  +// RUN: mlir-opt %s -vectorize -virtual-vector-size 3 -virtual-vector-size 32 --test-fastest-varying=1 --test-fastest-varying=0 -materialize-vectors -vector-size=3 -vector-size=16 | FileCheck %s -check-prefix=VEC2DTO2D
  // vector<32xf32> -> vector<8xf32>
  // VEC1DTO1D: [[MAP0:#.*]] = (d0, d1) -> (d0, d1)
  