Prefix the static shl function with '__' like its parent function __qdivrem to avoid being picked up by the DTrace fbt provider.
Prefix the static shl function with '__' like its parent function __qdivrem to
avoid being picked up by the DTrace fbt provider.

This is called by __udivdi3() for doing 64bit division on a 32bit arch and may
be called from within the dtrace context causing a double fault.

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