Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

trunc-03.txt
# RUN: llvm-mc --disassemble %s -triple=s390x-linux-gnu 2>&1 | FileCheck %s
# If the top bits are 0b11, the instruction must be 6 bytes long.
# CHECK: warning: invalid instruction encoding
# CHECK-NEXT: 0xed 0x00 0x00 0x00 0x00
0xed 0x00 0x00 0x00 0x00