ICU-22781 Adding support for constant denominators (C++) #3354

Job	Run time
clang-valgrind-test	49s
clang-valgrind-intltest (utility)	33s
clang-valgrind-intltest (normalize)	46s
clang-valgrind-intltest (collator)	47s
clang-valgrind-intltest (regex)	46s
clang-valgrind-intltest (format)	47s
clang-valgrind-intltest (translit)	33s
clang-valgrind-intltest (rbbi)	47s
clang-valgrind-intltest (rbnf)	48s
clang-valgrind-intltest (rbnfrt)	46s
clang-valgrind-intltest (icuserv)	47s
clang-valgrind-intltest (idna)	47s
clang-valgrind-intltest (convert)	46s
clang-valgrind-intltest (rbnfp)	35s
clang-valgrind-intltest (csdet)	47s
clang-valgrind-intltest (spoof)	46s
clang-valgrind-intltest (bidi)	52s
	12m 42s

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