[clang] [llvm] [clang][deps] Overload `Filesystem::exists` in `DependencyScanningFilesystem` to have it use cached `status` (PR #88152)

[Artem Chikin via cfe-commits]

================
@@ -270,6 +270,12 @@ DependencyScanningWorkerFilesystem::status(const Twine 
&Path) {
   return Result->getStatus();
 }
 
+bool
+DependencyScanningWorkerFilesystem::exists(const Twine &Path) {
+  llvm::ErrorOr<llvm::vfs::Status> Status = status(Path);
----------------
artemcm wrote:

Which optimization are you referring to? 

https://github.com/llvm/llvm-project/pull/88152
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