simplify log2 check; currently we rely more on compiler than build system #612

Job	Run time
Build and test cmake:gcc9	30s
Build and test cmake:clang15	33s
Build and test cmake:clang15:asan	44s
Build and test cmake:clang15:tsan	45s
Build and test cmake:clang15:ubsan	50s
Build and test cmake:qemu-arm-neon-gcc	57s
Build and test cmake-osx:clang	40s
Build and test cmake-osx:gcc	54s
Build and test cmake-win64:msvc-rel	53s
Build and test cmake-win64:msvc-dbg	45s
Build and test fuzz:clang15	30s
Build and test python3.10:clang15	1m 46s
Build and test python3.10-win	52s
Build and test maven	33s
Build and test bazel:root	32s
Build and test bazel:go	59s
Build and test bazel:java	2m 3s
Build and test bazel:research	22s
Build and test bazel-osx:root	1m 45s
Build and test bazel-osx:go	1m 42s
Build and test bazel-osx:java	2m 48s
Build and test bazel-osx:research	1m 46s
Build and test bazel-win:root	1m 54s
Build and test bazel-win:java	3m 50s
Build and test bazel-win:research	1m 35s
	30m 28s

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