Add RISC-V platform and PAUSE instruction#1262

Merged

Amanieu merged 2 commits intorust-lang:masterfrom

luojia65:riscv-pause

Dec 5, 2021

Commits on Dec 2, 2021

Add RISC-V platform on `core::arch`
luojia65
committed

Commits on Dec 4, 2021

Add `PAUSE` instruction to RISC-V `core::arch`
luojia65
committed