Introduce cuf.sync_descriptor to be used to sync device global
descriptor after pointer association.
Also move CUFCommon so it can be used in FIRBuilder lib as well.
1. In `CufOpConversion` `isDeviceGlobal` was renamed
`isRegisteredGlobal` and moved to the common file. `isRegisteredGlobal`
excludes constant `fir.global` operation from registration. This is to
avoid calls to `_FortranACUFGetDeviceAddress` on globals which do not
have any symbols in the runtime. This was done for
`_FortranACUFRegisterVariable` in #118582, but also needs to be done
here after #118591
2. `CufDeviceGlobal` no longer adds the `#cuf.cuda<constant>` attribute
to the constant global. As discussed in #118582 a module variable with
the #cuf.cuda<constant> attribute is not a compile time constant. Yet,
the compile time constant also needs to be copied into the GPU module.
The candidates for copy to the GPU modules are
- the globals needing regsitrations regardless of their uses in device
code (they can be referred to in host code as well)
- the compile time constant when used in device code
3. The registration of "constant" module device variables (
#cuf.cuda<constant>) can be restored in `CufAddConstructor`
Update the implicit global detection by looking for them in the CUF
kernel and also update to a walk so nested `fir.address_of` in nested
statement are also accounted for.
For consistency with other dialects and other CUF passes and files, this
patch renames passes CufOpConversion to CUFOpConversion,
CufImplicitDeviceGlobal to CUFDeviceGlobal.
It also renames the file.
