[clang] [llvm] [clang][deps] Add in-flight query caching to `DependencyScanningFilesystemSharedCache` (PR #199680)

[Artem Chikin via cfe-commits]

================
@@ -286,3 +345,138 @@ TEST(DependencyScanningFilesystem, 
DoNotDiagnoseDirSizeChange) {
   auto InvalidEntries = SharedCache.getOutOfDateEntries(*FS);
   EXPECT_EQ(InvalidEntries.size(), 0u);
 }
+
+TEST(DependencyScanningWorkerFilesystem, ConcurrentSameFilenameDeduplicates) {
+  auto InMemoryFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
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artemcm wrote:

Rewrote to use temporary on-disk files. 

https://github.com/llvm/llvm-project/pull/199680
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