remove some do while loops #1451

Job	Run time
Linux-GCC7-deps=forcefallback	8m 27s
Linux-GCC7-deps=default	1m 23s
Linux-GCC13-deps=forcefallback	9m 10s
Linux-Clang7-deps=forcefallback	8m 15s
MSVC-forcefallback-x64	4m 42s
Linux-GCC13-deps=default	2m 11s
Linux-Clang7-deps=default	1m 24s
MSVC-forcefallback-x86	5m 7s
Linux-Clang19-deps=forcefallback	9m 32s
MSVC-default-x64	2m 28s
MSVC-default-x86	3m 31s
Linux-Clang19-deps=default	2m 14s
clang-cl-forcefallback	5m 15s
clang-cl-default	2m 38s
Emscripten	3m 38s
FreeBSD	4m 9s
macOS-deps=enabled	1m 6s
macOS-deps=disabled	47s
MSYS2-UCRT64-deps=enabled	4m 45s
MSYS2-CLANG64-deps=enabled	3m 21s
MSYS2-UCRT64-deps=disabled	3m 13s
MSYS2-CLANG64-deps=disabled	2m 26s
	1h 29m 42s

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