Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

sabd-diagnostics.s
// RUN: not llvm-mc -triple=aarch64 -show-encoding -mattr=+sve  2>&1 < %s| FileCheck %s

sabd    z0.b, p8/m, z0.b, z0.b
// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid restricted predicate register, expected p0..p7 (without element suffix)
// CHECK-NEXT: sabd    z0.b, p8/m, z0.b, z0.b
// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}: