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The Go assembler documentation does not contain an architectural specific section for riscv64.  As the Go assembler has a slightly odd syntax and it reserves certain registers for itself, this makes it difficult for people not involved in the riscv64 port on a daily basis to write riscv64 code using the assembler.  Let's fix this.  The other architectures have their own sections in the assembler documentation.  riscv64 should do as well.