test: export isRiscv64 from common module #5710

Job	Run time
Build slim tarball	2m 27s
aarch64-linux: with shared libraries	21m 55s
x86_64-linux: with shared libraries	27m 2s
x86_64-darwin: with shared libraries	42m 39s
aarch64-darwin: with shared libraries	20m 47s
	1h 54m 50s

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