risc64: Add description for arch registers #1958
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It'd be a lot easier to understand the assembly code by having description table for architecture registers.
This patch adds the register table to mcount.S for RISC-V[1].
References:
[1] https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/v1.0/riscv-cc.adoc#integer-register-convention