use less memory for debugCallLength Map #79

Job	Run time
lib_mingw (monero)	3m 34s
lib_mingw (wownero)	3m 22s
lib_android (monero)	26m 12s
lib_android (wownero)	24m 43s
lib_linux (monero)	2m 55s
lib_linux (wownero)	2m 51s
lib_sailfishos_aarch64 (monero)	3m 50s
lib_darwin (monero)	13m 48s
lib_sailfishos_aarch64 (wownero)	3m 45s
lib_darwin (wownero)	13m 7s
macos build (monero)	2m 55s
macos build (wownero)	3m 13s
lib_sailfishos_i486 (monero)	2m 16s
lib_sailfishos_i486 (wownero)	2m 44s
ios build (monero)	10m 48s
ios build (wownero)	11m 26s
wallet_xmruw_android (monero)	7m 55s
wallet_xmruw_android (wownero)	7m 1s
wallet_cake_android	19m 20s
comment on pr	4s
	2h 45m 49s

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