In general case, the module where built-ins are looked up
(builtInsModule) can have multiple package fragments corresponding to
the package "kotlin". Remove the misleading method
getBuiltInsPackageFragment along with its implementation details and use
the package view's scope instead (by changing
KotlinBuiltIns.getBuiltInsPackageScope), since it'll iterate over all
fragments accessible in the module and its dependencies.
The only difference between scopes of package fragment and package view
is that the latter also contains package views for subpackages, which is
why the change in BuiltInsReferenceResolverTest is necessary
Alexander Udalov
e19c6ce23c