Adjust default GC allocation area #1880

Job	Run time
Build Echidna on ubuntu-20.04	20m 31s
Build Echidna on ubuntu-20.04	20m 31s
Build Echidna on macos-latest	34m 27s
Build Echidna on macos-latest	34m 27s
Build Echidna on windows-latest	24m 3s
Build Echidna on windows-latest	24m 3s
Test with solc 0.4.25 on ubuntu-latest	2m 10s
Test with solc 0.4.25 on ubuntu-latest	2m 10s
Test with solc 0.5.7 on ubuntu-latest	2m 11s
Test with solc 0.5.7 on ubuntu-latest	2m 11s
Test with solc 0.6.12 on ubuntu-latest	2m 27s
Test with solc 0.6.12 on ubuntu-latest	2m 27s
Test with solc 0.7.5 on ubuntu-latest	2m 34s
Test with solc 0.7.5 on ubuntu-latest	2m 19s
Test with solc 0.4.25 on windows-latest	3m 35s
Test with solc 0.4.25 on windows-latest	3m 35s
Test with solc 0.5.7 on windows-latest	3m 24s
Test with solc 0.5.7 on windows-latest	3m 24s
Test with solc 0.6.12 on windows-latest	3m 28s
Test with solc 0.6.12 on windows-latest	3m 28s
Test with solc 0.7.5 on windows-latest	4m 17s
Test with solc 0.7.5 on windows-latest	4m 17s
	3h 25m 59s

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