James Y Knight 9ddbb478ce
NFC: Clean up construction of IntrusiveRefCntPtr from raw pointers for llvm::vfs::FileSystem. (#151407)
This switches to `makeIntrusiveRefCnt<FileSystem>` where creating a new
object, and to passing/returning by `IntrusiveRefCntPtr<FileSystem>`
instead of `FileSystem*` or `FileSystem&`, when dealing with existing
objects.

Part of cleanup #151026.
2025-07-31 09:57:13 -04:00
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