[clang] [C++20] [Modules] Don't generate call to an imported module that dont init anything (PR #67638)

[Iain Sandoe via cfe-commits]

https://github.com/iains commented:

Thanks for working on this.

Generally, this LGTM, but perhaps we can choose names that are unambiguously related to state - the current one could be read like an action.

maybe something like:

`NamedModuleHasNoInit`
and
`namedModuleHasNoInit()`

(or I'm open to other suggestions) .. 


https://github.com/llvm/llvm-project/pull/67638