Fix assert in CMS stage #7898

Job	Run time
Warmup caches	1m 25s
Conformance Build AVX3	4m 3s
Conformance Build AVX2	3m 3s
Conformance Build SSE4	3m 8s
Conformance Build SSSE3	2m 4s
Conformance Build EMU128	2m 34s
Conformance Build SCALAR	2m 42s
Conformance Build SCALAR_ASAN	3m 19s
Conformance Test main_level5 on AVX3	1m 26s
Conformance Test main_level5 on AVX2	1m 30s
Conformance Test main_level5 on SSE4	2m 8s
Conformance Test main_level5 on SSSE3	1m 38s
Conformance Test main_level5 on EMU128	1m 26s
Conformance Test main_level5 on SCALAR	1m 36s
Conformance Test main_level5 on SCALAR_ASAN	2m 22s
Conformance Test main_level10 on AVX3	1m 42s
Conformance Test main_level10 on AVX2	1m 26s
Conformance Test main_level10 on SSE4	1m 52s
Conformance Test main_level10 on SSSE3	1m 43s
Conformance Test main_level10 on EMU128	2m 4s
Conformance Test main_level10 on SCALAR	1m 45s
Conformance Test main_level10 on SCALAR_ASAN	2m 5s
	47m 1s

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