Martin Storsjö 46ec93a457 [Support] [VirtualFileSystem] Detect the windows_slash path style ...

This fixes the following clang VFS tests, if `windows_slash` is the
default style:

  Clang :: VFS/implicit-include.c
  Clang :: VFS/relative-path.c
  Clang-Unit :: Frontend/./FrontendTests.exe/CompilerInstance.DefaultVFSOverlayFromInvocation

Also clarify a couple references to `Style::windows` into
`Style::windows_backslash`, to make it clearer that each of them are
opinionated in different directions (even if it doesn't matter for
calls to e.g. `is_absolute`).

Differential Revision: https://reviews.llvm.org/D113272

2021-11-08 22:21:29 +02:00

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