support multi-phase initialization #1432

Job	Run time
Build and test with Python 2.7	48s
Build and test cmake:clang:ubsan	57s
Build and test python3.10:clang	2m 0s
Build and test cmake:clang-old	49s
Build and test cmake-osx:gcc	27s
Build and test cmake:qemu-arm-neon-gcc	2m 45s
Build and test bazel-win:root	1m 20s
Build and test maven	38s
Build and test cmake-win64:msvc-rel	2m 0s
Build and test bazel:root	53s
Build and test fuzz:clang	43s
Build and test cmake:clang:tsan	1m 6s
Build and test bazel:go	1m 10s
Build and test bazel-win:research	1m 10s
Build and test bazel:research	44s
Build and test cmake-win64:msvc-dbg	39s
Build and test cmake:clang:asan	53s
Build and test cmake-osx:clang	29s
Build and test bazel-osx:go	1m 12s
Build and test bazel:java	2m 10s
Build and test cmake:gcc-old	50s
Build and test bazel-osx:root	1m 14s
Build and test python3.10-win	43s
Build and test bazel-osx:java	2m 58s
Build and test bazel-osx:research	1m 1s
	29m 39s

Provide feedback