cpu: aarch64: fix acl matmul dim guard for 4d tensor broadcast #2183
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Description
This fix addresses a corner case that causes a segfault in AArch64 matmul. Since this shape wasn't covered in the test cases, I have also updated tests/benchdnn/inputs/matmul/shapes_4d.
For now, we simply redispatch when this shape is encountered and will look for a better solution in the future.
Checklist
General
make test
andmake test_benchdnn_*
) pass locally for each commit?