rnk added a comment. My understanding is that Windows doesn't allow you to delete a file that has been opened and mapped into any process, even if it has been opened with FILE_SHARE_DELETE. One way to work around this would be to avoid memory mapping files in the SourceManager when using the Rewriter. Then FILE_SHARE_DELETE will do what you want. There should be a parameter to MemoryBuffer::getFile to control this. However, I think it really would be cleaner if we unmapped all of our MemoryBuffers of inputs before overwriting them in place. Keeping those buffers around feels like having dangling references.
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