Add clang-format check to CI

This PR adds a check to the CI right after checking out the Torch-MLIR
repository to make sure that the changes in the PR don't require any
`git clang-format` modifications.

.github/workflows/lint.yml

@@ -12,6 +12,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+        with: submodules: true
       - name: Validate GitHub Actions yaml files
         run: |
           yamllint ./.github/workflows/ ./.github/actions/
+
+      - name: Check clang-format
+        run: |
+          ./externals/llvm-project/clang/tools/clang-format/git-clang-format origin/main --diff

lib/Dialect/Torch/Transforms/DecomposeComplexOps.cpp

@@ -46,7 +46,7 @@ static bool isNoneOrFloatDtype(MLIRContext *context, Value dtype) {
 static Type computeReductionType(PatternRewriter &rewriter, Operation *op,
                                  BaseTensorType tensorType, Value dim,
                                  bool keepDim) {
-  SmallVector<int64_t> sizes;
+     SmallVector<int64_t> sizes;
   int64_t dimInt;
   if (tensorType.hasSizes()) {
     ArrayRef<int64_t> inputShape = tensorType.getSizes();