Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

objdump-thumb.test
RUN: llvm-objdump -d --macho --triple=thumbv7-apple-ios \
RUN: %p/../Inputs/macho-text.thumb | FileCheck %s

CHECK: 0:	00 bf                                        	nop