Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
## Test the use of "--" on the commandline # RUN: echo contents > %t.txt # RUN: rm -f %t.ar # RUN: llvm-ar rc -- %t.ar %t.txt 2>&1 | count 0 # RUN: llvm-ar p %t.ar | FileCheck %s # CHECK: contents