Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

DbgValueOtherTargets.test
RUN: llc -O0 -mtriple=ppc32-- -asm-verbose < %S/../Inputs/DbgValueOtherTargets.ll | FileCheck %S/../Inputs/DbgValueOtherTargets.ll