[PATCH] D121425: [VFS] Add a new getVFSFromYAMLs API

[Ben Barham via Phabricator via llvm-commits]

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With `RedirectingFileSystem` simplified to handling only path mapping,
its old behaviour has to be implemented elsewhere.

Add a new API that takes multiple overlays (buffers or paths) and maps
them into an `OverlayFileSystem` taking into account the "fallthrough"
and "redirecting-with" properties in the YAML overlay specifications.

Note that this comes with a slight change in semantics, it is no longer
possible to chain VFS mappings. Given an overlay with a mapping of A ->
B and another overlay with a mapping B -> C, A will no longer map to C.
A -> C must be specified as its own mapping if this is desired.

Depends on D121421 <https://reviews.llvm.org/D121421> and D121423 <https://reviews.llvm.org/D121423> and D121424 <https://reviews.llvm.org/D121424>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121425

Files:
  llvm/include/llvm/Support/VirtualFileSystem.h
  llvm/lib/Support/VirtualFileSystem.cpp
  llvm/unittests/Support/VirtualFileSystemTest.cpp

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