This adds a check for exported inline functions, that there is a definition in
the definition domain (which, in practice, can only be the module purview but
before any PMF starts) since the PMF definition domain cannot contain exports.
This is:
[dcl.inline]/7
If an inline function or variable that is attached to a named module is declared in
a definition domain, it shall be defined in that domain.
The patch also amends diagnostic output by excluding the PMF sub-module from the
set considered as sources of missing decls. There is no point in telling the user
that the import of a PMF object is missing - since such objects are never reachable
to an importer. We still show the definition (as unreachable), to help point out
this.
Differential Revision: https://reviews.llvm.org/D128328
Iain Sandoe