Don't force initialization for buffers whose contents we will immediately destroy #4420

Job	Run time
git_checks	5s
format	31s
linux_ubuntu (ubuntu20.04, gcc8, shared, mpich)	16m 42s
linux_ubuntu (ubuntu20.04, gcc9, shared, mpich)	19m 7s
macos (macos11, serial)	27m 22s
linux_el8 (el8, icc, mpich)	26m 9s
windows (win2019, serial)	10m 52s
linux_ubuntu (ubuntu20.04, gcc10, shared, mpich)	19m 37s
macos (macos12, serial)	5m 31s
linux_el8 (el8, oneapi, mpich)	23m 29s
windows (win2019, ompi)	15m 37s
linux_ubuntu (ubuntu20.04, gcc11, shared, mpich)	17m 50s
windows (win2022, serial)	8m 51s
linux_ubuntu (ubuntu20.04, clang6, shared, mpich)	11m 22s
windows (win2022, ompi)	13m 3s
docker (ubuntu-bionic)	7m 41s
CodeQL (cpp)	30m 5s
linux_ubuntu (ubuntu20.04, clang10, shared, mpich)	14m 54s
linux_ubuntu (ubuntu20.04, gcc8, ompi)	35m 49s
linux_ubuntu (ubuntu20.04, gcc8, serial)	10m 27s
linux_ubuntu (ubuntu20.04, clang6, ompi)	32m 54s
linux_ubuntu (ubuntu20.04, clang6, serial)	8m 38s
linux_ubuntu (ubuntu20.04, gcc8, static, ompi, build_only)	6m 54s
linux_ubuntu (ubuntu20.04, clang6, static, ompi, build_only)	5m 14s
linux_ubuntu (ubuntu20.04, gcc8, static, serial)	7m 32s
contract (examples)	2m 9s
contract (lammps)	4m 14s
contract (tau)	10m 44s
build_and_test	1s
	6h 33m 24s

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