Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

macho-cold.test
RUN: llc -O0 -mtriple=aarch64-apple-ios %p/Inputs/cold-func.ll -filetype=obj -o %t.aarch64.o
RUN: llvm-nm -m %t.aarch64.o | FileCheck %s

CHECK: [cold func] _cold_func