Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

coff-disassemble-export.test
// RUN: llvm-objdump -d %p/Inputs/disassemble.dll.coff-i386 | \
// RUN:   FileCheck %s

// CHECK-LABEL: <g>:
// CHECK: calll 0x10001010 <f>

// CHECK-LABEL: f:
// CHECK: calll 0x10001000 <g>