ICU-22511 collator hang in comparison #2354

Job	Run time
clang-valgrind-intltest (utility)	7m 4s
clang-valgrind-intltest (normalize)	6m 56s
clang-valgrind-test	9m 59s
clang-valgrind-intltest (collator)	4m 59s
clang-valgrind-intltest (regex)	5m 0s
clang-valgrind-intltest (format)	16m 44s
clang-valgrind-intltest (translit)	6m 15s
clang-valgrind-intltest (rbbi)	6m 56s
clang-valgrind-intltest (rbnf)	6m 2s
clang-valgrind-intltest (rbnfrt)	5m 57s
clang-valgrind-intltest (icuserv)	5m 0s
clang-valgrind-intltest (idna)	4m 56s
clang-valgrind-intltest (convert)	6m 33s
clang-valgrind-intltest (rbnfp)	4m 58s
clang-valgrind-intltest (csdet)	4m 59s
clang-valgrind-intltest (spoof)	4m 58s
clang-valgrind-intltest (bidi)	5m 28s
	1h 52m 44s

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