; RUN: llvm-as < %s  | opt -jump-threading -simplifycfg | llvm-dis | grep {ret i32 0}
; PR3138

define i32 @jt() {
entry:
       br i1 true, label %bb3, label %bb

bb:             ; preds = %entry
       unreachable

bb3:            ; preds = %entry
       ret i32 0
}