[clang][deps] Don't cache stat failures for .framework directories

[jansvoboda11]

Summary

The .framework directory might be created during the course of the build. Some scanning worker finding out it
doesn't exist yet at the start shouldn't make it impossible for subsequent workers to see it when it evetually gets
created.

clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp

 //===- DependencyScanningFilesystem.cpp - clang-scan-deps fs --------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
if (Ext.empty())
     return PathPolicy::cache(ScanFile::Yes, CacheStatFailure::No);
   // clang-format off
   return llvm::StringSwitch<PathPolicy>(Ext)
       .CasesLower(".c", ".cc", ".cpp", ".c++", ".cxx", PathPolicy::cache(ScanFile::Yes))
       .CasesLower(".h", ".hh", ".hpp", ".h++", ".hxx", PathPolicy::cache(ScanFile::Yes))
       .CasesLower(".m", ".mm",                         PathPolicy::cache(ScanFile::Yes))
       .CasesLower(".i", ".ii", ".mi", ".mmi",          PathPolicy::cache(ScanFile::Yes))
       .CasesLower(".def", ".inc",                      PathPolicy::cache(ScanFile::Yes))
+      .CaseLower(".framework", PathPolicy::cache(ScanFile::No, CacheStatFailure::No))
       .CasesLower(".modulemap", ".map",      PathPolicy::cache(ScanFile::No))
-      .CasesLower(".framework", ".apinotes", PathPolicy::cache(ScanFile::No))
+      .CaseLower(".apinotes",                PathPolicy::cache(ScanFile::No))
       .CasesLower(".yaml", ".json", ".hmap", PathPolicy::cache(ScanFile::No))
       .Default(PathPolicy::fallThrough());
   // clang-format on
 }
 
 const CachedFileSystemEntry &
 DependencyScanningWorkerFilesystem::getOrEmplaceSharedEntryForUID(
     TentativeEntry TEntry) {