Fix assert in CMS stage #7903

Job	Run time
Conformance Build AVX3	3m 15s
Conformance Build AVX2	3m 11s
Conformance Build SSE4	2m 20s
Conformance Build SSSE3	2m 12s
Conformance Build EMU128	2m 10s
Conformance Build SCALAR	2m 32s
Conformance Build SCALAR_ASAN	3m 34s
Warmup caches	1m 18s
Conformance Test main_level5 on AVX3	1m 41s
Conformance Test main_level5 on AVX2	1m 33s
Conformance Test main_level5 on SSE4	1m 30s
Conformance Test main_level5 on SSSE3	1m 36s
Conformance Test main_level5 on EMU128	1m 28s
Conformance Test main_level5 on SCALAR	1m 28s
Conformance Test main_level5 on SCALAR_ASAN	1m 59s
Conformance Test main_level10 on AVX3	1m 21s
Conformance Test main_level10 on AVX2	1m 34s
Conformance Test main_level10 on SSE4	1m 50s
Conformance Test main_level10 on SSSE3	1m 24s
Conformance Test main_level10 on EMU128	1m 53s
Conformance Test main_level10 on SCALAR	1m 32s
Conformance Test main_level10 on SCALAR_ASAN	2m 4s
	43m 25s

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