Merge branch 'master' of https://github.com/ornl-qci/qcor

# EXPERIMENTAL!!! Prototype Quantum MLIR Dialect

# Quantum MLIR Dialect

## Building

As of now, we need a separate MLIR install

```bash

git clone https://github.com/llvm/llvm-project.git llvm_mlir

mkdir llvm_mlir/build

cd llvm_mlir/build

cmake -G Ninja ../llvm \

   -DLLVM_ENABLE_PROJECTS=mlir \

   -DBUILD_SHARED_LIBS=TRUE

   -DLLVM_BUILD_EXAMPLES=ON \

   -DLLVM_TARGETS_TO_BUILD="X86" \

   -DCMAKE_BUILD_TYPE=Release \

   -DLLVM_ENABLE_ASSERTIONS=ON \

   -DCMAKE_INSTALL_PREFIX=$HOME/.mlir

cmake --build . --target install

```

Just add `-DMLIR_DIR=$HOME/.mlir/lib/cmake/mlir` to CMake call for building qcor.

Just add `-DMLIR_DIR=/path/to/llvm_with_mlir/lib/cmake/mlir` to CMake call for building qcor.