Fix AVX512 compilation with GCC 7 (#1438) #2386

Job	Run time
build-python-wheels (ubuntu-20.04, auto64)	53m 56s
build-python-wheels (macos-11, auto64)	41m 30s
build-python-wheels (windows-2019, auto64)	1h 9m 19s
build-python-wheels (ubuntu-20.04, aarch64)	2h 25m 4s
build-python-wheels (macos-11, arm64)	12m 29s
check-python-style	12s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	8m 30s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	7m 27s
build-and-test-cpp-x86_64 (macos-11, mkl)	11m 18s
build-and-test-cpp-x86_64 (macos-11, dnnl)	11m 43s
build-and-test-cpp-aarch64 (openblas)	7m 58s
build-and-push-docker-images	38m 20s
test-python-wheels (ubuntu-20.04)	11m 48s
test-python-wheels (macos-11)	6m 17s
test-python-wheels (windows-2019)	4m 5s
build-and-deploy-docs	46s
publish-python-wheels-on-pypi	0s
	7h 10m 42s

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