--nnpa-placement-heuristic fails on mobilenetv2-12 with Assertion `aM == bM && "expected M dims to be identical"

[cjvolzka]

Attempting to compile mobilenetv2-12.onnx with --nnpa-placement-heuristic using any value other than QualifyingOps fails to compile model.

Failure example:

podman run --rm -it --workdir=/workdir -v ./:/workdir:z -u $UID:$UID --userns=keep-id onnxmlir/onnx-mlir:latest --O3 --EmitLib --mtriple=s390x-ibm-loz --mcpu=z16 --maccel=NNPA ./mobilenetv2-12.onnx --onnx-op-stats TXT --nnpa-placement-heuristic=FasterOps
onnx-mlir: /workdir/onnx-mlir/src/Accelerators/NNPA/Conversion/ONNXToZHigh/PerfModel.cpp:142: void (anonymous namespace)::estimateTimeForMatMulOp(Operation *, Value, Value, bool, bool, const DimAnalysis *, double &, double &): Assertion `aM == bM && "expected M dims to be identical"' failed.