message: Use c++14 for building with CMake
  This is getting rid of some warnings, and C++14 is supposed to be
  the default soon anyway.
diff: @@ -97,7 +97,7 @@ git clone https://github.com/tensorflow/mlir
  cd ../..
  mkdir build
  cd build
  -cmake -G Ninja ../llvm -DLLVM_BUILD_EXAMPLES=ON
  +cmake -G Ninja ../llvm -DLLVM_BUILD_EXAMPLES=ON -DLLVM_ENABLE_CXX1Y=Y
  ninja check-mlir
  ```
  