[ci] Change Windows PR Action to use Unified B/T/I (#5955)

Change the GitHub Action that checks that the "main" branch isn't broken
for Windows builds to use the Unified Build/Test/Install Action.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

.github/workflows/buildAndTestWindows.yml

@@ -1,6 +1,7 @@
 name: Windows build and test
 
-# Run on request and every day at 12 noon UTC
+# Run on main (after PRs land) to ensure that they aren't heinously breaking the
+# Windows build.
 on:
   push:
     branches:
@@ -11,82 +12,13 @@ jobs:
   # Build CIRCT and run its tests.
   build-circt:
     name: Build and Test
-    runs-on: windows-2019
-    steps:
-      - name: Configure Environment
-        run: echo "$GITHUB_WORKSPACE/llvm/install/bin" >> $GITHUB_PATH
-
-      # Clone the CIRCT repo and its submodules. Do shallow clone to save clone
-      # time.
-      - name: Get CIRCT
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 2
-          submodules: "true"
-
-      # --------
-      # Restore LLVM from cache and build if it's not in there.
-      # --------
-
-      # Extract the LLVM submodule hash for use in the cache key.
-      - name: Get LLVM Hash
-        id: get-llvm-hash
-        run: echo "hash=$(git rev-parse @:./llvm)" >> $GITHUB_OUTPUT
-        shell: bash
-
-      # Try to fetch LLVM from the cache.
-      - name: Cache LLVM
-        id: cache-llvm
-        uses: actions/cache@v3
-        with:
-          path: |
-            llvm/install
-          key: ${{ runner.os }}-llvm-relobj-${{ steps.get-llvm-hash.outputs.hash }}
-
-      # Build LLVM if we didn't hit in the cache. Even though we build it in
-      # the previous job, there is a low chance that it'll have been evicted by
-      # the time we get here.
-      - name: Rebuild and Install LLVM
-        if: steps.cache-llvm.outputs.cache-hit != 'true'
-        shell: pwsh
-        run: |
-          ./utils/find-vs.ps1
-          mkdir llvm/build
-          cd llvm/build
-          cmake ..\llvm -GNinja `
-            -DLLVM_ENABLE_PROJECTS=mlir -DLLVM_BUILD_EXAMPLES=OFF `
-            -DLLVM_TARGETS_TO_BUILD="host" `
-            -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON `
-            -DLLVM_INSTALL_GTEST=ON -DLLVM_INSTALL_UTILS=ON `
-            -DCMAKE_INSTALL_PREFIX="$(pwd)/../install"
-          cmake --build . --target install --config Release
-          # Grab llvm-lit.py from build tree, we need it.
-          cp -v bin/llvm-lit.py ../install/bin/
-          # Nuke build tree to save disk space.
-          cd ..
-          rm -r -fo build
-          
-
-      # --------
-      # Build and test CIRCT in both debug and release mode.
-      # --------
-
-      # Build the CIRCT test target in release mode. The cmake scripts on
-      # Windows only support building with the same configuration as MLIR.
-      - name: Build and test CIRCT (release)
-        shell: pwsh
-        run: |
-          ./utils/find-vs.ps1
-          mkdir build_release
-          cd build_release
-          cmake ../ -GNinja `
-            -DLLVM_ENABLE_ASSERTIONS=ON `
-            -DMLIR_DIR="$(pwd)/../llvm/install/lib/cmake/mlir/" `
-            -DLLVM_DIR="$(pwd)/../llvm/install/lib/cmake/llvm/" `
-            -DLLVM_EXTERNAL_LIT="$(pwd)/../llvm/install/bin/llvm-lit.py" `
-            -DCMAKE_BUILD_TYPE=RelWithDebInfo `
-            -DLLVM_LIT_ARGS="-v"
-          cmake --build . --config RelWithDebInfo
-          cmake --build . --target check-circt
-
-    # --- end of build-circt job.
+    uses: ./.github/workflows/unifiedBuildTestAndInstall.yml
+    with:
+      runner: windows-2019
+      cmake_build_type: release
+      llvm_enable_assertions: ON
+      build_shared_libs: OFF
+      llvm_force_enable_stats: ON
+      runTests: true
+      cmake_c_compiler: cl
+      cmake_cxx_compiler: cl