Previously the OpenCL address space overloads of remquo would call into
the one and only 'private' CLC remquo. This was an outlier compared with
the other pointer-argumented maths builtins.
This commit moves the definitions of all address space overloads to the
CLC library to give more control over each address space to CLC
implementers.
There are some minor changes to the generated bytecode but it's simply
moving IR instructions around.
0bc7f41db8