[PATCH] Self-referencing metadata

[Joshua Klontz]

As an LLVM beginner it took me a long time to figure out the correct API
calls to implement the self-referencing metadata required by llvm.loop.
Perhaps this patch can save others in a similar situation some trouble in
the future.

This patch is also a sanity check of my own understanding. Therefore, if it
is totally off-base then I apologize for the noise :)

Kindly,
Josh
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