use less memory for debugCallLength Map (#48) #87

Job	Run time
lib_android (monero)	27m 18s
lib_darwin (monero)	14m 18s
lib_android (wownero)	24m 12s
lib_darwin (wownero)	13m 17s
ios build (monero)	9m 40s
lib_linux (monero)	3m 6s
ios build (wownero)	12m 50s
lib_linux (wownero)	2m 59s
macos build (monero)	3m 12s
lib_mingw (monero)	3m 53s
lib_mingw (wownero)	3m 10s
macos build (wownero)	3m 41s
lib_sailfishos_aarch64 (monero)	3m 40s
lib_sailfishos_i486 (monero)	3m 12s
lib_sailfishos_aarch64 (wownero)	3m 35s
lib_sailfishos_i486 (wownero)	2m 1s
wallet_cake_android	17m 19s
wallet_xmruw_android (monero)	7m 3s
wallet_xmruw_android (wownero)	6m 58s
comment on pr	0s
	2h 45m 24s

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