js-tokens: use preload source code #750

Job	Run time
Test Browser on macOS (safari, default)	1m 16s
Test Browser on macOS (safari, disabled)	1m 10s
Test Browser on Linux (chrome, default)	1m 2s
Test Browser on Linux (firefox, default)	1m 19s
Test Browser on Linux (chrome, disabled)	1m 9s
Test Browser on macOS (safari, main)	49s
Test Browser on Linux (chrome, main)	35s
Test Build	28s
Test Browser on Linux (firefox, disabled)	1m 23s
Test Shell (spidermonkey, main)	46s
Test Shell (jsc, default)	3m 5s
Test Browser on Linux (firefox, main)	1m 8s
Test Shell (jsc, disabled)	1m 45s
Test Shell (jsc, main)	39s
Test Shell (v8, disabled)	1m 40s
Test Shell (spidermonkey, default)	5m 16s
Test Shell (v8, default)	2m 53s
Test Shell (v8, main)	39s
Test Shell (spidermonkey, disabled)	2m 12s
	29m 14s

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