v8: adding total_allocated_bytes to HeapStatistics #602

Job	Run time
Build slim tarball	1m 27s
aarch64-linux: with shared libraries	25m 1s
aarch64-darwin: with shared libraries	26m 28s
x86_64-darwin: with shared libraries	1h 3m 6s
x86_64-linux: with shared libraries	26m 48s
	2h 22m 50s

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