Create host-end IR to input parameters to kernel function

 + Add setHostIterators.
 + Add clearHostIterators.
 + Add allocateDeviceArguments.
 + Add copyArgumentsToDevice.
Make name of the kernel function parameters more readable
Implement copy kernel function arguments to device memory
[Fix] Get memory size for memcpy

GPU memcpy size should be array length multiplied with element type size.
Fix comments that demo the usage of the GPURuntime library
Seperate freeDeviceMemory from cleanupGPUResource

Update GPURuntime library so that we can free multiple device arrays
and parameters.
[Fix] Generate correct loads for multiple arrays in kernel