Got an error when building llvm

I follow these commands
```
git clone https://github.com/llvm/llvm-project.git
git fetch --all --tags
git checkout tags/llvmorg-12-init -b

mkdir llvm-project/build
cd llvm-project/build
cmake -G Ninja ../llvm \
-DLLVM_ENABLE_PROJECTS=mlir \
-DLLVM_BUILD_EXAMPLES=ON \
-DLLVM_TARGETS_TO_BUILD="Native;NVPTX;AMDGPU" \
-DCMAKE_BUILD_TYPE=Release \
-DLLVM_ENABLE_ASSERTIONS=ON

cmake --build . --target check-mlir
```
And When I try to build，I got error as follows.
```
Failed Tests (6):
MLIR :: mlir-cpu-runner/bare_ptr_call_conv.mlir
MLIR :: mlir-cpu-runner/linalg_integration_test.mlir
MLIR :: mlir-cpu-runner/sgemm_naive_codegen.mlir
MLIR :: mlir-cpu-runner/simple.mlir
MLIR :: mlir-cpu-runner/unranked_memref.mlir
MLIR :: mlir-cpu-runner/utils.mlir

Testing Time: 6.27s
Unsupported: 22
Passed : 531
Failed : 6
```