Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

directives.test
RUN: llvm-readobj --coff-directives %p/Inputs/directives.obj.coff-x86_64 | FileCheck %s
CHECK: Directive(s): /DEFAULTLIB:"LIBCMT" /DEFAULTLIB:"OLDNAMES"