Resolve name when named imp is behind wild imps

When a named import (such as `import bug.util.List`) is defined before
two clashing wildcard imports (`import bug.util.*; import java.util.*`)
the name "List" should resolve to it, rather than a resolution error
being emitted.

This was due to the fact that `findRefRecur` didn't return the
precedence at which it found that import, `checkImportAlternatives` used
the `prevPrec` to `checkNewOrShadowed`.  Now we check against the entire
`foundResult`, allowing an early named import to be picked over later
wildcard imports.

[Cherry-picked 08d592f][modified]

Author: tgodzik