Fix assert in CMS stage #6304

Job	Run time
Cross-compiling arm64	6m 26s
Cross-compiling arm64-sve	7m 13s
Cross-compiling arm64-lowprecision	6m 56s
Cross-compiling armhf	5m 54s
Cross-compiling i386	5m 54s
Testing arm64 shard 0	6s
Testing arm64-lowprecision shard 0	9s
Testing armhf shard 0	5s
Testing i386 shard 0	3m 9s
Testing arm64 shard 1	9s
Testing arm64-lowprecision shard 1	4s
Testing armhf shard 1	8s
Testing i386 shard 1	3m 13s
Testing arm64 shard 2	26s
Testing arm64-lowprecision shard 2	6s
Testing armhf shard 2	10s
Testing i386 shard 2	3m 26s
Testing arm64 shard 3	24s
Testing arm64-lowprecision shard 3	6s
Testing armhf shard 3	9s
Testing i386 shard 3	3m 15s
Testing arm64 shard 4	9s
Testing arm64-lowprecision shard 4	6s
Testing armhf shard 4	12s
Testing i386 shard 4	9s
Testing arm64 shard 5	11s
Testing arm64-lowprecision shard 5	5s
Testing armhf shard 5	9s
Testing i386 shard 5	9s
Testing arm64 shard 6	9s
Testing arm64-lowprecision shard 6	9s
Testing armhf shard 6	20s
Testing i386 shard 6	7s
Testing arm64 shard 7	10s
Testing arm64-lowprecision shard 7	7s
Testing armhf shard 7	4s
Testing i386 shard 7	5s
	49m 49s

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