There seems to be an inconsistency in the way that the type.Info.Uses
map is populated by the type checker in Go 1.5 and the latest release.
It is possible to ascertain the package that relates to an object 1.7.x
release but this does not work for earlier Go versions.
To work around this limitation we now track imports, and monitor if they
are aliased or initalization only imports.
This introduces a helper function that will significantly reduce the
number of false positives that occur due to the use of regexp based
call matching.
It resolves the object related to a CallExpr and checks that against the
supplied package and identifier name. If both of these match the
returned value is the CallExpr and Object.
