Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

externally-initialized.ll
; RUN: opt < %s -internalize -S | FileCheck %s
; RUN: opt < %s -passes=internalize -S | FileCheck %s

; CHECK: @G0
; CHECK-NOT: internal
; CHECK-SAME: global i32
@G0 = protected externally_initialized global i32 0, align 4