<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/119511>119511</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [MachineSink] llc hang caused by #115111
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            llvm:codegen,
            llvm:hang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          dtcxzyw
      </td>
    </tr>
</table>

<pre>
    Reproducer:
```
; timeout 0.5s bin/llc reduced.ll
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

define i32 @main() {
entry:
  br label %lbl_1680.i.us.i.outer

lbl_1680.i.us.i: ; preds = %lbl_1680.i.us.i.outer, %lbl_1680.i.us.i
  br i1 %tobool415.not.i99.us.i, label %lbl_1680.i.us.i.outer, label %lbl_1680.i.us.i

lbl_1680.i.us.i.outer:                            ; preds = %lbl_1680.i.us.i, %entry
  %tobool415.not.i99.us.i = phi i1 [ true, %entry ], [ false, %lbl_1680.i.us.i ]
  br label %lbl_1680.i.us.i
}
```
Bisected to https://github.com/llvm/llvm-project/pull/115111.
cc @paperchalice @qcolombet @chapuni 

</pre>
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