Fix a race between split and next/prev

############################################

#  RUN PARAMETERS

############################################

abort=0

alter=0

auto_throttle=1

backups=0

bitcnt=5

bloom=1

bloom_bit_count=39

bloom_hash_count=26

bloom_oldest=0

cache=32

cache_minimum=20

checkpoints=off

checkpoint_log_size=84

checkpoint_wait=42

checksum=uncompressed

chunk_size=8

compaction=0

compression=none

data_extend=0

data_source=file

delete_pct=0

dictionary=0

direct_io=0

encryption=none

evict_max=1

file_type=row-store

firstfit=0

huffman_key=0

huffman_value=0

independent_thread_rng=1

in_memory=1

insert_pct=28

internal_key_truncation=1

internal_page_max=13

isolation=read-committed

key_gap=15

key_max=32

key_min=15

leaf_page_max=10

leak_memory=0

logging=0

logging_archive=1

logging_compression=none

logging_file_max=253963

logging_prealloc=1

long_running_txn=0

lsm_worker_threads=4

merge_max=19

mmap=1

modify_pct=44

ops=100000

prefix_compression=1

prefix_compression_min=7

quiet=1

read_pct=14

rebalance=0

repeat_data_pct=47

reverse=0

rows=100000

runs=100

salvage=0

split_pct=55

statistics=0

statistics_server=0

threads=32

timer=360

transaction_timestamps=0

transaction-frequency=99

truncate=1

value_max=80

value_min=15

verify=0

wiredtiger_config=

write_pct=14

############################################

t: FAILED: WT_CURSOR.prev returned {0000092500.00/opqrstuvwxyzabcdefghijklmno ... really, really, really long key} then {0000090018.00/opqrst}

process aborting