Re-export some 'Way' related functions in DynFlags

.github/workflows/ci.yml

-name: CI
-
-# Trigger the workflow on push or pull request, but only for the master branch
-on:
-  pull_request:
-  push:
-    branches: [master]
-
-jobs:
-  cabal:
-    name: ${{ matrix.os }} / ghc ${{ matrix.ghc }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-latest]
-        cabal: ["latest"]
-        ghc: ["8.6", "8.8", "8.10"]
-
-    steps:
-    - uses: actions/checkout@v2
-      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
-
-    - uses: actions/setup-haskell@v1.1
-      id: setup-haskell-cabal
-      name: Setup Haskell
-      with:
-        ghc-version: ${{ matrix.ghc }}
-        cabal-version: ${{ matrix.cabal }}
-
-    - name: Build
-      run: |
-        cabal update
-        cabal build all --enable-tests --enable-benchmarks --write-ghc-environment-files=always
-
-    - name: Test
-      run: |
-        cabal test all --enable-tests