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Fix lazy-collections doubleFibonaccis #745

Job	Run time
Test Build	26s
Test Browser on macOS (safari, disabled)	2m 55s
Test Browser on macOS (safari, main)	1m 47s
Test Browser on macOS (safari, default)	1m 17s
Test Browser on Linux (chrome, main)	36s
Test Browser on Linux (firefox, main)	48s
Test Browser on Linux (firefox, default)	1m 5s
Test Shell (jsc, main)	44s
Test Browser on Linux (chrome, disabled)	1m 5s
Test Browser on Linux (firefox, disabled)	1m 17s
Test Browser on Linux (chrome, default)	52s
Test Shell (jsc, default)	1m 48s
Test Shell (jsc, disabled)	1m 49s
Test Shell (spidermonkey, default)	2m 24s
Test Shell (spidermonkey, main)	52s
Test Shell (v8, default)	1m 35s
Test Shell (spidermonkey, disabled)	2m 19s
Test Shell (v8, disabled)	1m 35s
Test Shell (v8, main)	46s
	26m 0s