Fix bug in BitWriter::WriteMultiple. (#4027) #673

Job	Run time
Cross-compiling arm64	5m 57s
Cross-compiling arm64-sve	6m 53s
Cross-compiling arm64-lowprecision	5m 40s
Cross-compiling armhf	5m 18s
Cross-compiling i386	6m 10s
Testing arm64 shard 0	17m 45s
Testing arm64-lowprecision shard 0	20m 49s
Testing armhf shard 0	20m 56s
Testing i386 shard 0	3m 29s
Testing arm64 shard 1	19m 12s
Testing arm64-lowprecision shard 1	17m 10s
Testing armhf shard 1	22m 48s
Testing i386 shard 1	3m 0s
Testing arm64 shard 2	16m 25s
Testing arm64-lowprecision shard 2	17m 58s
Testing armhf shard 2	18m 44s
Testing i386 shard 2	3m 12s
Testing arm64 shard 3	18m 32s
Testing arm64-lowprecision shard 3	18m 11s
Testing armhf shard 3	21m 16s
Testing i386 shard 3	3m 8s
Testing arm64 shard 4	19m 10s
Testing arm64-lowprecision shard 4	18m 8s
Testing armhf shard 4	22m 0s
Testing i386 shard 4	5s
Testing arm64 shard 5	16m 51s
Testing arm64-lowprecision shard 5	18m 28s
Testing armhf shard 5	19m 36s
Testing i386 shard 5	9s
Testing arm64 shard 6	18m 2s
Testing arm64-lowprecision shard 6	18m 25s
Testing armhf shard 6	19m 52s
Testing i386 shard 6	8s
Testing arm64 shard 7	20m 45s
Testing arm64-lowprecision shard 7	17m 15s
Testing armhf shard 7	25m 15s
Testing i386 shard 7	6s
	8h 26m 48s

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