test_runner: propagate V8 options to child process #1491

Job	Run time
Build slim tarball	1m 34s
x86_64-linux: with shared libraries	29m 57s
aarch64-darwin: with shared libraries	32m 54s
x86_64-darwin: with shared libraries	47m 8s
aarch64-linux: with shared libraries	24m 50s
	2h 16m 23s

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