Scalable-friendly dct-inl.h #10979

Job	Run time
Warmup caches	32s
Conformance Build AVX3	1m 40s
Conformance Build AVX2	2m 6s
Conformance Build SSE4	1m 14s
Conformance Build SSSE3	1m 32s
Conformance Build EMU128	1m 36s
Conformance Build SCALAR	1m 6s
Conformance Build SCALAR_ASAN	1m 21s
Conformance Test main_level5 on AVX3	1m 1s
Conformance Test main_level5 on AVX2	46s
Conformance Test main_level5 on SSE4	55s
Conformance Test main_level5 on SSSE3	50s
Conformance Test main_level5 on EMU128	56s
Conformance Test main_level5 on SCALAR	53s
Conformance Test main_level5 on SCALAR_ASAN	1m 26s
Conformance Test main_level10 on AVX3	54s
Conformance Test main_level10 on AVX2	55s
Conformance Test main_level10 on SSE4	59s
Conformance Test main_level10 on SSSE3	1m 2s
Conformance Test main_level10 on EMU128	1m 7s
Conformance Test main_level10 on SCALAR	1m 34s
Conformance Test main_level10 on SCALAR_ASAN	1m 31s
	25m 56s

Provide feedback