core-all-system-modules: Restrict visibility.

Only the language level 9 version of the targets that (for language
level 8) depend on core-all should be able to depend on
core-all-system-modules; therefore, those two targets should have
the same visibility.

This CL enforces that by defining a constant core_all_visibility that is
used to define the visibility of both build rules.

Test: Treehugger

Change-Id: Idaf0582beea316e328526d4acfbb6f182511f928
1 file changed