Merge changes from topic "hiddenapi-cherrypick"

* changes:
  Fix hiddenapi::MemberSignature for proxies
  Do not overwrite hidden access flags for intrinsics
  Fix race in hidden_api.h
  Fix hidden API flags decoding for intrinsics
  Set hidden API flags of intrinsics
  Use tron for logging hidden API accesses.
  Add VMRuntime.setDedupeHiddenApiWarnings().
  Add note about tests impacted by kLogAllAccesses flag.
  Fix test after ag/3881475.
  Log for light grey API accesses.
  Log an event on hidden API accesses.
  Consider whitelist when listing class members.
  Treat hidden API exemptions as whitelist.
  Fix verifier/linker IncompatibleClassChangeError with hidden API
  Replace kAllLists policy with kJustWarn.