Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

symbolize-gnu-debuglink.test
RUN: llvm-symbolizer --obj=%p/Inputs/dwarfdump-test.elf-x86-64.debuglink 0x40113f | FileCheck %s

CHECK:       main
CHECK-NEXT: /tmp/dbginfo{{[/\\]}}dwarfdump-test.cc:16