Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; RUN: opt -S -passes=instcombine < %s | FileCheck %s define void @test1() { entry: call void @tan() ret void } ; CHECK-LABEL: define void @test1( ; CHECK: call void @tan() ; CHECK-NEXT: ret void declare void @tan()