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1; RUN: opt -S < %s -passes=objc-arc-expand,objc-arc-contract | FileCheck %s2; Don't crash. Reproducer for a use_iterator bug from r203364.3; rdar://problem/163332354target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"5target triple = "x86_64-apple-darwin13.2.0"6 7%struct = type { ptr, ptr }8 9; CHECK-LABEL: @foo() {10define internal ptr @foo() {11entry:12 %call = call ptr @bar()13; CHECK: %retained1 = call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %call)14 %retained1 = call ptr @llvm.objc.retain(ptr %call)15 %isnull = icmp eq ptr %retained1, null16 br i1 %isnull, label %cleanup, label %if.end17 18if.end:19; CHECK: %retained2 = call ptr @llvm.objc.retain(ptr %retained1)20 %retained2 = call ptr @llvm.objc.retain(ptr %retained1)21 br label %cleanup22 23cleanup:24 %retval = phi ptr [ %retained2, %if.end ], [ null, %entry ]25 ret ptr %retval26}27 28declare ptr @bar()29 30declare extern_weak ptr @llvm.objc.retain(ptr)31