Feature: declarations cleanup #1909

Job	Run time
build-mingw (windows-2022, ucrt64)	2m 34s
build-mingw (windows-2022, clang64)	2m 20s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 41s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 37s
build-linux (focal, 96b_carbon)	32s
size-diff	45s
build-linux (focal, bluepill)	36s
build-linux (focal, f072)	36s
build-linux (focal, f3)	31s
build-linux (focal, f4discovery)	36s
build-linux (focal, hydrabus)	38s
build-linux (focal, launchpad-icdi)	33s
build-linux (focal, native)	38s
build-linux (focal, stlink)	37s
build-linux (focal, stlinkv3)	34s
build-linux (focal, swlink)	33s
	19m 21s

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