remove some do while loops #1456

Job	Run time
Emscripten	2m 50s
FreeBSD	4m 5s
macOS-deps=enabled	1m 6s
MSYS2-UCRT64-deps=enabled	4m 43s
macOS-deps=disabled	57s
Linux-GCC7-deps=forcefallback	8m 12s
MSYS2-CLANG64-deps=enabled	3m 13s
Linux-Clang7-deps=forcefallback	8m 24s
Linux-GCC7-deps=default	1m 27s
MSYS2-UCRT64-deps=disabled	3m 12s
Linux-Clang7-deps=default	1m 27s
Linux-GCC13-deps=forcefallback	9m 6s
MSYS2-CLANG64-deps=disabled	2m 30s
MSVC-forcefallback-x64	5m 19s
Linux-Clang19-deps=forcefallback	9m 20s
Linux-GCC13-deps=default	2m 3s
MSVC-forcefallback-x86	4m 50s
Linux-Clang19-deps=default	2m 16s
MSVC-default-x64	3m 9s
clang-cl-forcefallback	4m 12s
MSVC-default-x86	2m 30s
clang-cl-default	3m 31s
	1h 28m 22s

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