v8: adding total_allocated_bytes to HeapStatistics #679

Job	Run time
Build slim tarball	1m 29s
x86_64-darwin: with shared libraries	1h 4m 28s
aarch64-darwin: with shared libraries	28m 0s
aarch64-linux: with shared libraries	23m 8s
x86_64-linux: with shared libraries	28m 32s
	2h 25m 37s

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