[PATCH] Use -ivfsoverlay in ASTUnit

[Ben Langmuir]

Hi Dmitri and Argyrios,

Could one (or both) of you take a look at my changes to the ASTUnit to support the VFS? The VFS needs to be created for most/all of the FileManagers that get created, and I’m a bit worried by the sheer number of FileManager and SourceManager creations that I needed to plug up.

Ben

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