Can't foreach over a recursiveiteratoriterator in nightly - typechecker error
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Description
From the oss-performance repo:
```
base/HHVMDaemon.php:183:16,20: Invalid foreach (Typing[4110])
base/HHVMDaemon.php:183:16,20: This is an object of type KeyedTraversable because this is used in a foreach statement
base/HHVMDaemon.php:182:15,54: It is incompatible with an object of type RecursiveIteratorIterator
```
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