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Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

metadata-a.ll
; RUN: llvm-link %s %p/metadata-b.ll -S -o - | FileCheck %s

; CHECK: define void @foo(i32 %a)
; CHECK: ret void, !attach !0
; CHECK: define void @goo(i32 %b)
; CHECK: ret void, !attach !1
; CHECK: !0 = !{i32 524334, void (i32)* @foo}
; CHECK: !1 = !{i32 524334, void (i32)* @goo}

define void @foo(i32 %a) nounwind {
entry:
  ret void, !attach !0
}

!0 = !{i32 524334, void (i32)* @foo}