This change adapts the existing context to use more suitable non-channel-based
methods. This is a requisite for migrating the kernel internals to a
sleeper-based notification mechanism.
The last uses of amutex outside those migrated as part of this change were
dropped in a previous change. Since amutex depends on the channel-based
implementation, this package is also deleted as part of this change.
PiperOrigin-RevId: 415189675
Because the abi will depend on the core types for marshalling (usermem,
context, safemem, safecopy), these need to be flattened from the sentry
directory. These packages contain no sentry-specific details.
PiperOrigin-RevId: 291811289
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