Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; Runs original SDAG test with -global-isel ; RUN: llc -global-isel -mtriple=amdgcn-amd-amdhsa -mcpu=bonaire -verify-machineinstrs < %S/../read_register.ll | FileCheck -enable-var-scope %S/../read_register.ll