visible in the module we're considering entering. Previously we assumed that if
we knew the include guard for a modular header, we'd already parsed it, but
that need not be the case if a header is present in the current module and one
of its dependencies; the result of getting this wrong was that the current
module's submodule for the header would end up empty.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@241953 91177308-0d34-0410-b5e6-96231b3b80d8
Richard Smith