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      1 ; RUN: opt -S < %s -loop-unroll -block-freq | FileCheck %s
      2 ; Crasher from PR20987.
      3 
      4 ; CHECK: define void @update_loop_info_in_subloops
      5 ; CHECK: entry:
      6 ; CHECK: L:
      7 ; CHECK: L.inner:
      8 ; CHECK: L.inner.latch:
      9 ; CHECK: L.latch:
     10 ; CHECK: L.inner.1:
     11 ; CHECK: L.inner.latch.1:
     12 ; CHECK: L.latch.1:
     13 
     14 define void @update_loop_info_in_subloops() {
     15 entry:
     16   br label %L
     17 
     18 L:
     19   %0 = phi i64 [ 1, %entry ], [ %1, %L.latch ]
     20   br label %L.inner
     21 
     22 L.inner:
     23   br label %L.inner.latch
     24 
     25 L.inner.latch:
     26   br i1 false, label %L.latch, label %L.inner
     27 
     28 L.latch:
     29   %1 = add i64 %0, 1
     30   %2 = icmp eq i64 %1, 3
     31   br i1 %2, label %exit, label %L
     32 
     33 exit:
     34   ret void
     35 }
     36