Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; RUN: opt -O0 -S < %s | FileCheck %s -check-prefix=A ; RUN: opt -O3 -S < %s | FileCheck %s -check-prefix=A define i32 @foo(i32 %i) { %r = add i32 1, 1 ret i32 %r }