stream: add kStreamBase marker for internal pipe optimization #2061

Job	Run time
Build slim tarball	1m 33s
aarch64-linux: with shared libraries	57m 34s
x86_64-linux: with shared libraries	1h 9m 25s
aarch64-darwin: with shared libraries	56m 53s
x86_64-darwin: with shared libraries	3h 11m 2s
	6h 16m 27s

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