regalloc2 0.15.1

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 --all-features --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

  # Make sure the code and its dependencies compile without std.
  no_std:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - name: Install thumbv6m-none-eabi target
      run: rustup target add thumbv6m-none-eabi
    - name: Check no_std build
      run: cargo check --target thumbv6m-none-eabi --no-default-features --features trace-log,checker,enable-serde

  # 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: cargo install cargo-deny
    - 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 all fuzz targets
      run: cargo +nightly fuzz build
      # Note: all fuzzers are run with `arbtest` during `cargo test` with the
      # `fuzzing` feature enabled.