riscv port for JEP 475 #271

Job	Run time
Select platforms	1s
docs / build (debug)	2m 43s
linux-x64 / build (debug)	5m 27s
linux-x64-hs-minimal / build (debug)	5m 28s
linux-cross-compile / build (aarch64)	5m 29s
linux-x64 / build (release)	5m 31s
linux-cross-compile / build (arm)	5m 28s
linux-x64-hs-nopch / build (debug)	5m 32s
linux-cross-compile / build (s390x)	5m 28s
linux-x64-hs-optimized / build (debug)	5m 30s
linux-cross-compile / build (ppc64le)	5m 30s
linux-x64-hs-zero / build (debug)	5m 26s
linux-cross-compile / build (riscv64)	1m 20s
linux-x86 / build (debug)	5m 27s
macos-aarch64 / build (debug)	5m 36s
linux-x86 / build (release)	5m 27s
macos-x64 / build (debug)	5m 28s
macos-aarch64 / build (release)	5m 34s
windows-aarch64 / build (debug)	5m 24s
macos-x64 / build (release)	5m 35s
windows-aarch64 / build (release)	5m 22s
windows-x64 / build (debug)	2m 26s
windows-x64 / build (release)	2m 18s
windows-x64	1s
linux-x86	1s
linux-x64	1s
macos-aarch64	1s
macos-x64	1s
Remove bundle artifacts	3s
	1h 47m 38s

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