[clang] [clang-tools-extra] [NFC] Explicitly pass a VFS when creating DiagnosticsEngine (PR #115852)

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git-clang-format --diff 41e3919ded78d8870f7c95e9181c7f7e29aa3cc4 a999e3081d16170d510ab74222564fbcb4c6a7c2 --extensions cpp,h -- clang-tools-extra/clang-include-fixer/IncludeFixer.cpp clang-tools-extra/clangd/Compiler.cpp clang-tools-extra/clangd/ModulesBuilder.cpp clang-tools-extra/clangd/Preamble.cpp clang-tools-extra/include-cleaner/unittests/RecordTest.cpp clang/include/clang/Frontend/CompilerInstance.h clang/lib/Frontend/CompilerInstance.cpp clang/lib/Frontend/CreateInvocationFromCommandLine.cpp clang/lib/Frontend/Rewrite/FrontendActions.cpp clang/lib/Interpreter/Interpreter.cpp clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp clang/lib/Testing/TestAST.cpp clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp clang/lib/Tooling/Tooling.cpp clang/tools/c-index-test/core_main.cpp clang/tools/clang-import-test/clang-import-test.cpp clang/tools/clang-installapi/ClangInstallAPI.cpp clang/tools/clang-scan-deps/ClangScanDeps.cpp clang/tools/diagtool/ShowEnabledWarnings.cpp clang/tools/driver/cc1_main.cpp clang/tools/libclang/CIndex.cpp clang/tools/libclang/Indexing.cpp clang/unittests/AST/ExternalASTSourceTest.cpp clang/unittests/CodeGen/TestCompiler.h clang/unittests/Driver/DXCModeTest.cpp clang/unittests/Driver/ToolChainTest.cpp clang/unittests/Frontend/ASTUnitTest.cpp clang/unittests/Frontend/CodeGenActionTest.cpp clang/unittests/Frontend/CompilerInstanceTest.cpp clang/unittests/Frontend/CompilerInvocationTest.cpp clang/unittests/Frontend/FrontendActionTest.cpp clang/unittests/Frontend/OutputStreamTest.cpp clang/unittests/Frontend/PCHPreambleTest.cpp clang/unittests/Frontend/ReparseWorkingDirTest.cpp clang/unittests/Frontend/UtilsTest.cpp clang/unittests/Sema/SemaNoloadLookupTest.cpp clang/unittests/Serialization/ForceCheckFileInputTest.cpp clang/unittests/Serialization/ModuleCacheTest.cpp clang/unittests/Serialization/NoCommentsTest.cpp clang/unittests/Serialization/PreambleInNamedModulesTest.cpp clang/unittests/Serialization/VarDeclConstantInitTest.cpp clang/unittests/Support/TimeProfilerTest.cpp clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp clang/unittests/Tooling/ToolingTest.cpp
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View the diff from clang-format here.
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diff --git a/clang/unittests/AST/ExternalASTSourceTest.cpp b/clang/unittests/AST/ExternalASTSourceTest.cpp
index 2561485888..8e1bde1247 100644
--- a/clang/unittests/AST/ExternalASTSourceTest.cpp
+++ b/clang/unittests/AST/ExternalASTSourceTest.cpp
@@ -10,9 +10,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/AST/ExternalASTSource.h"
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
-#include "clang/AST/ExternalASTSource.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendActions.h"

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https://github.com/llvm/llvm-project/pull/115852