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Stabilize Ratified RISC-V Target Features #1476

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Commits on Nov 30, 2023

  1. Stabilize Ratified RISC-V Target Features

    As shortly discussed on Zulip
    (https://rust-lang.zulipchat.com/#narrow/stream/250483-t-compiler.2Frisc-v/topic/Stabilization.20of.20RISC-V.20Target.20Features/near/394793704), this commit stabilizes the ratified RISC-V instruction bases and extensions.
    
    Specifically, this commit stabilizes the:
    * Atomic Instructions (A) on v2.0
    * Compressed Instructions (C) on v2.0
    * Integer Multiplication and Division (M) on v2.0
    * Bit Manipulations (B) on v1.0 listed as `zba`, `zbc`, `zbs`
    * Scalar Cryptography (Zk) v1.0.1 listed as `zk`, `zkn`, `zknd`, `zkne`, `zknh`, `zkr`, `zks`, `zksed`, `zksh`, `zkt`, `zbkb`, `zbkc` `zkbx`
    coastalwhite committed Nov 30, 2023
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