Add tests for Module.declare_intrinsic.
Add tests for Module.declare_intrinsic.

ssarangi/llvmlite,pitrou/llvmlite,squisher/llvmlite,numba/llvmlite,m-labs/llvmlite,numba/llvmlite,markdewing/llvmlite,ssarangi/llvmlite,numba/llvmlite,markdewing/llvmlite,m-labs/llvmlite,markdewing/llvmlite,markdewing/llvmlite,m-labs/llvmlite,squisher/llvmlite,numba/llvmlite,ssarangi/llvmlite,pitrou/llvmlite,m-labs/llvmlite,ssarangi/llvmlite,pitrou/llvmlite,pitrou/llvmlite,squisher/llvmlite,squisher/llvmlite