Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

archs-ir-binary.test
# RUN: llvm-as %p/Inputs/armv7-ios.ll -o %t-armv7.o
# RUN: llvm-lipo -archs %t-armv7.o | FileCheck %s

# CHECK: armv7