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Add generic CSR instructions, CSR symbolic names and also missing pseudo instructions for accessing the floating point CSRs. Note in the documentation that instructions that modify CSRs can only be safely used in assembly for now.

Dependency
Upstreaming	Ongoing	https://go-review.googlesource.com/c/go/+/630518 https://go-review.googlesource.com/c/go/+/630519/7 https://go-review.googlesource.com/c/go/+/650577/6 https://go-review.googlesource.com/c/go/+/614356 https://github.com/riscv/riscv-opcodes/commit/3c733921341af7f966e9af40570131f5fb4e5d87
Upstream version
Contacts	@Ludovic Henry

LR_02_031: Add CSR support to the Go assembler

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