VarDCT block size selection tuning #17261

Job	Run time
Ubuntu Build tsan	1m 43s
Ubuntu Build release-nojpeg	1m 19s
Ubuntu Build asan	2m 2s
Ubuntu Build lowprecision	8m 31s
Ubuntu Build debug	1m 25s
Ubuntu Build coverage	1m 1s
Ubuntu Build msan	3m 33s
Ubuntu Build release-lcms2	1m 20s
Ubuntu Build release:gcc-old	1m 19s
Ubuntu Build release:arm64-lowprecision	7m 28s
Ubuntu Build scalar	1m 17s
Ubuntu Build release:clang-old	1m 20s
Ubuntu Build release	8m 46s
Ubuntu Build release_lto:gcc	8m 17s
Ubuntu Build release:arm64	7m 36s
Ubuntu Build release-system-lcms2	1m 47s
Ubuntu Build release:gcc	1m 29s
Ubuntu Build release_lto	4m 14s
Ubuntu Build release:gcc-old-old	1m 36s
Ubuntu Build release:minimal	1m 33s
Ubuntu Build release_android	2m 20s
MacOS Build release_ios	2m 19s
MacOS Build release:osx	2m 30s
MacOS Build debug:osx-13	2m 21s
MacOS Build release:osx-15	1m 49s
Ubuntu Build release:clang-old-old	1m 13s
	1h 20m 8s

Provide feedback