…strap.

First and foremost, this flag is meant to be a debugging tool for
Systrap-related issues; very often the first step to debugging Systrap errors is
to ask users to disable syscall patching, and this makes that easier. Secondly,
it is also meant to be a temporary stop-gap to fix workloads that don't work
with syscall patching until the universal solution is implemented to roll-back
existing patches to their original state at runtime.

Updates #11649.

PiperOrigin-RevId: 756520044