regalloc2 0.5.1

Backtracking register allocator inspired from IonMonkey
Documentation 
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# Derived from regalloc.rs' GitHub CI config file.

name: Rust

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

jobs:
  # Lint code with rustfmt, report an error if it needs to be run.
  lint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - name: Install rustfmt
      run: rustup component add rustfmt
    - name: Run rustfmt and check there's no difference
      run: cargo fmt --all -- --check

  # Make sure the code compiles and that all the tests pass.
  build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - name: Build
      run: cargo build
    - name: Run tests
      run: cargo test --all --verbose

  # Make sure the code typechecks with non-default features enabled.
  features:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - name: Check with all features
      run: cargo check --all-features

  # Lint dependency graph for security advisories, duplicate versions, and
  # incompatible licences.
  cargo_deny:
    name: Cargo deny
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
      with:
        submodules: true
    - run: |
        set -e
        curl -L https://github.com/EmbarkStudios/cargo-deny/releases/download/0.8.5/cargo-deny-0.8.5-x86_64-unknown-linux-musl.tar.gz | tar xzf -
        mv cargo-deny-*-x86_64-unknown-linux-musl/cargo-deny cargo-deny
        echo `pwd` >> $GITHUB_PATH
    - run: cargo deny check

  # Builds the fuzz targets.
  fuzz:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - name: Install nightly
      run: rustup toolchain install nightly
    - name: Install cargo-fuzz
      run: cargo +nightly install cargo-fuzz
    - name: Build ssagen fuzzing target
      run: cargo +nightly fuzz build ssagen
    - name: Build moves fuzzing target
      run: cargo +nightly fuzz build moves
    - name: Build ion fuzzing target
      run: cargo +nightly fuzz build ion
    - name: Build and smoke-test ion_checker fuzzing target
      run: cargo +nightly fuzz run ion_checker ./fuzz/smoketest/ion_checker.bin