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Delete main? This cannot be undone.

llvm.amdgcn.unreachable.ll
; RUN: llc -march amdgcn %s -filetype=obj -o /dev/null
; RUN: llc -march amdgcn <%s | FileCheck %s
define amdgpu_kernel void @f() {
  ; CHECK: ; divergent unreachable
  call void @llvm.amdgcn.unreachable()
  ret void
}

declare void @llvm.amdgcn.unreachable()