Merge pull request #1189 from fengyuentau:dnn/elementwise_layers/speedup

add gelu conformance tests

Author: asmorkalov

testdata/dnn/onnx/conformance/node/test_gelu_default_1/model.onnx

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testdata/dnn/onnx/conformance/node/test_gelu_default_1/test_data_set_0/input_0.pb

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