The shared cross-file call pass bound an unqualified call to any
same-named def in the corpus. In Elixir an unqualified call can only
reach the caller's own module, Kernel, or a module the file imports or
uses, so DSL calls landed on unrelated project functions: every
migration's `table(:users)` (Ecto.Migration, brought in by `use`) became
a calls edge to a Phoenix component's `table/1`, making it the top god
node.
The Elixir extractor now records, on each raw call, the modules its file
names in `import` or `use` (`alias` and `require` do not bring functions
into scope). The shared pass keeps only candidates whose file defines one
of those modules, the same way Go selectors are already filtered by
import path, and leaves the call unresolved otherwise. The module index
is read from the resolution nodes, so an unchanged file's modules still
count on an incremental rebuild.
Calls into a module that a `use` macro imports indirectly (for example
`use MyAppWeb, :live_view` importing CoreComponents) are no longer
resolved, since that import is not visible in the source.
Refs #4001
(cherry picked from commit 98d4ae9878)
