Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

label-undefined.s
// RUN: not llvm-mc -filetype=obj -triple i386-pc-win32 %s 2>&1 | FileCheck %s
// CHECK: assembler label 'Lundefined' can not be undefined
// CHECK: assembler label 'Lundefined2' can not be undefined
        .text
        movl Lundefined, %eax
        movl Lundefined2, %eax