implement faster HashMap #994

Job	Run time
cpp-lib-build (macos-11, clang, ON)	8m 7s
build (macos-11, tool)	1m 50s
cpp-lib-build (macos-11, clang, OFF)	8m 0s
build (macos-11, cpp)	34m 56s
cpp-lib-build (macos-11, gcc, ON)	8m 27s
build (macos-11, csharp)	9m 56s
cpp-lib-build (macos-11, gcc, OFF)	9m 0s
build (macos-11, dart)	6m 0s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 16s
build (macos-11, go)	4m 43s
build (macos-11, java)	2m 8s
cpp-lib-build (ubuntu-20.04, clang, OFF)	3m 20s
cpp-lib-build (ubuntu-20.04, gcc, ON)	4m 26s
build (macos-11, javascript)	2m 44s
build (macos-11, typescript)	20m 41s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 38s
cpp-lib-build (windows-2022, clang, ON)	6m 46s
build (macos-11, php)	20s
cpp-lib-build (windows-2022, clang, OFF)	6m 58s
build (macos-11, python3)	2m 25s
build (ubuntu-20.04, tool)	52s
cpp-lib-build (windows-2022, cl)	5m 3s
build (ubuntu-20.04, cpp)	17m 36s
build (ubuntu-20.04, csharp)	5m 4s
build (ubuntu-20.04, dart)	3m 36s
build (ubuntu-20.04, go)	2m 22s
build (ubuntu-20.04, java)	1m 17s
build (ubuntu-20.04, javascript)	1m 29s
build (ubuntu-20.04, typescript)	9m 55s
build (ubuntu-20.04, php)	1m 18s
build (ubuntu-20.04, python3)	1m 0s
build (windows-2022, tool)	1m 48s
build (windows-2022, cpp)	22m 34s
build (windows-2022, csharp)	7m 26s
build (windows-2022, dart)	4m 47s
build (windows-2022, go)	5m 27s
build (windows-2022, java)	1m 51s
build (windows-2022, javascript)	2m 34s
build (windows-2022, typescript)	22m 35s
build (windows-2022, php)	2m 28s
build (windows-2022, python3)	1m 56s
	4h 31m 39s

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