some cleanup for LRCC2 #1980

Job	Run time
macos-latest: clang++ Release Threads	11m 6s
macos-latest: clang++ Release OneTBB	1m 47s
macos-latest: clang++ Release PaRSEC	1m 47s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	36m 11s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 2s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	1m 59s
macos-latest: clang++ Debug Threads	23m 47s
macos-latest: clang++ Debug OneTBB	2m 4s
macos-latest: clang++ Debug PaRSEC	1m 59s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	48m 35s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	1m 43s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	1m 53s
	2h 14m 53s

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