Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

sparc-vis.s
! RUN: llvm-mc %s -arch=sparcv9 -mcpu=niagara -show-encoding | FileCheck %s

        ! CHECK: fzeros %f31   ! encoding: [0xbf,0xb0,0x0c,0x20]
        fzeros %f31