[PATCH] Make CloneFunction also clone debug info metadata

[Mishne, Alon]

Right now CloneFunction ignores the debug info metadata, which can lead to debug info loss when the cloned function is used. This patch modifies that so that if the 'ModuleLevelChanges' parameter to CloneFunction is true, any debug info metadata for the old function is cloned for the new function.

Also expanded the cloning unit tests to test for this new functionality.

Additionally, one of my tests required checking for an empty DIArray, but apparently DIBuilder doesn't make those - if asked to create an empty array, it creates an array with a single "null" value instead. I've changed DIBuilder to no longer do that because I don't understand why it's done and all the tests still pass after the change.
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