Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

pr28630.ll
; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -verify-machineinstrs -O0 < %s

define double @test() {
  ret double 1.000000e+00
}

@g = common global double 0.000000e+00, align 8

define double @testitd() {
  %g = load double, double* @g, align 8
  ret double %g
}