Now that we define user mode as any IP address that isn't in the

kernel's VA regions, we cannot limit the use of break-based
syscalls to user mode only. The signal trampolines are in the
gateway page, which is mapped into the process address space in
region 5 and thus is kernel space.

We don't special case the gateway page here. Allow break-based
syscalls from anywhere in the kernel VA space.

Approved by: re@ (blanket)

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