Fix the shape of c in gemm ops with a transpose #2679

Job	Run time
build-and-push-docker-images	27m 25s
build-and-test-cpp-aarch64 (openblas)	4m 16s
build-python-wheels (ubuntu-20.04, auto64)	33m 17s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 37s
build-python-wheels (macos-11, auto64)	38m 56s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 34s
check-python-style	9s
build-python-wheels (windows-2019, auto64)	44m 12s
build-and-test-cpp-x86_64 (macos-11, mkl)	11m 55s
build-python-wheels (ubuntu-20.04, aarch64)	1h 12m 40s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 46s
build-python-wheels (macos-11, arm64)	12m 10s
build-and-deploy-docs	33s
test-python-wheels (ubuntu-20.04)	10m 20s
test-python-wheels (macos-11)	5m 31s
test-python-wheels (windows-2019)	4m 32s
publish-python-wheels-on-pypi	0s
	4h 46m 53s

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