The code to check with the shared cache binary provider was previously
in the native host platform (PlatformDarwinDevice), but it also needs to
be called from PlatformAppleSimulator for simulator debug sessions. Move
the code to the base class PlatformDarwin and call it from both
subclasses. No changes to the code itself, just moving it to the base
class.
rdar://170693756
4cdbb95d91