loader: add experimental text import #4467

Job	Run time
Build slim tarball	2m 0s
aarch64-linux: with shared libraries	20m 55s
aarch64-darwin: with shared libraries	23m 11s
x86_64-linux: with shared libraries	25m 54s
x86_64-darwin: with shared libraries	39m 38s
	1h 51m 38s

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