Build and run tests (macOS)

Merge pull request #3966 from jix/fix-nullptr-fixup-hierarchy-flags #2246

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Run time

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Job	Run time
test-macos (macos-11, Big Sur, c++11)	34m 22s
test-macos (macos-11, Big Sur, c++17)	16m 10s
	50m 32s