Getting fully qualified names of random qualtypes

[Sterling Augustine via cfe-commits]

As requested on cfe-dev, enclosed is a patch (that needs some
style-related work) to calculate the complete fully qualified name of
arbitrary Qualtypes, including recursively expanding template
parameters and subtypes.

Seems to me like it follows most of the conventions described here:

http://llvm.org/docs/CodingStandards.html

but I'm told it needs more work. Happy to oblige.
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