--expt-relaxed-constexpr is not supported in HIP ... see https://gith… #817

Job	Run time
macos-latest: clang++ Release Pthreads	53m 46s
macos-latest: clang++ Release PaRSEC	43m 28s
macos-latest: clang++ Debug Pthreads	46m 12s
macos-latest: clang++ Debug PaRSEC	40m 14s
macos-latest: /usr/local/bin/g++-10 Release Pthreads	51m 14s
macos-latest: /usr/local/bin/g++-10 Release PaRSEC	39m 29s
macos-latest: /usr/local/bin/g++-10 Debug Pthreads	54m 34s
macos-latest: /usr/local/bin/g++-10 Debug PaRSEC	34m 24s
	6h 3m 21s

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