Hashtree uses trailing storage instead of array member hack #5810

Job	Run time
debug_all_tests (ubuntu-latest)	4m 19s
release_all_tests (ubuntu-latest)	4m 12s
debug64 (ubuntu-latest)	4m 22s
debug64_all_tests (ubuntu-latest)	5m 12s
debug (ubuntu-latest)	5m 10s
release (ubuntu-latest)	3m 52s
Release64 (ubuntu-latest)	3m 51s
Release64_all_tests (ubuntu-latest)	3m 59s
	34m 57s

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