Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
# RUN: llvm-mc %s -arch=mips64 -mcpu=mips64r2 -mattr=+msa -show-encoding | FileCheck %s copy_s.d $19, $w31[0] # CHECK: copy_s.d $19, $w31[0] # encoding: [0x78,0xb8,0xfc,0xd9]