Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

arm64-v128_lo-diagnostics.s
// RUN: not llvm-mc -triple arm64 -mattr=neon %s 2> %t > /dev/null
// RUN: FileCheck %s < %t

        sqrdmulh v0.8h, v1.8h, v16.h[0]
// CHECK: error: invalid operand for instruction

        sqrdmulh h0, h1, v16.h[0]
// CHECK: error: invalid operand for instruction

        sqdmull2 v0.4h, v1.8h, v16.h[0]
// CHECK: error: invalid operand for instruction