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b81afd6598
if an experimental setting has been removed/is missing. Add tests for the .experimental. settings behaviors -- that they correctly forward through to the real setting if it has become a real setting, that they don't generate errors when a settig has been removed. As Pavel notes in https://reviews.llvm.org/D45348, the way I'm suppressing errors in the setting is not completely correct - if any of the setting path components include "experimental", a missing setting would be declared a non-error. So settings set target.experimental.setting-that-does-not-exist true would not generate an error, which is correct. But as Pavel notes, settings set setting-does-not-exist.experimental.run-stopped true should generate an error because the unknown name occurs before the "experimental". The amount of change to do this correctly hasn't thrilled me, so I'm leaving this as-is for now. <rdar://problem/39223054> Differential Revision: https://reviews.llvm.org/D45348 llvm-svn: 331315