Update prebuilt Clang to r416183b from Android.

https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef

clang 12.0.5 (based on r416183b) from build 7284624.

Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/include/clang-tidy/utils/FileExtensionsUtils.h b/linux-x64/clang/include/clang-tidy/utils/FileExtensionsUtils.h
new file mode 100644
index 0000000..26184a5
--- /dev/null
+++ b/linux-x64/clang/include/clang-tidy/utils/FileExtensionsUtils.h
@@ -0,0 +1,68 @@
+//===--- FileExtensionsUtils.h - clang-tidy --------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_UTILS_FILE_EXTENSIONS_UTILS_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_UTILS_FILE_EXTENSIONS_UTILS_H
+
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace clang {
+namespace tidy {
+namespace utils {
+
+typedef llvm::SmallSet<llvm::StringRef, 5> FileExtensionsSet;
+
+/// Checks whether expansion location of \p Loc is in header file.
+bool isExpansionLocInHeaderFile(SourceLocation Loc, const SourceManager &SM,
+                                const FileExtensionsSet &HeaderFileExtensions);
+
+/// Checks whether presumed location of \p Loc is in header file.
+bool isPresumedLocInHeaderFile(SourceLocation Loc, SourceManager &SM,
+                               const FileExtensionsSet &HeaderFileExtensions);
+
+/// Checks whether spelling location of \p Loc is in header file.
+bool isSpellingLocInHeaderFile(SourceLocation Loc, SourceManager &SM,
+                               const FileExtensionsSet &HeaderFileExtensions);
+
+/// Returns recommended default value for the list of header file
+/// extensions.
+inline StringRef defaultHeaderFileExtensions() { return ";h;hh;hpp;hxx"; }
+
+/// Returns recommended default value for the list of implementation file
+/// extensions.
+inline StringRef defaultImplementationFileExtensions() {
+  return "c;cc;cpp;cxx";
+}
+
+/// Returns recommended default value for the list of file extension
+/// delimiters.
+inline StringRef defaultFileExtensionDelimiters() { return ",;"; }
+
+/// Parses header file extensions from a semicolon-separated list.
+bool parseFileExtensions(StringRef AllFileExtensions,
+                         FileExtensionsSet &FileExtensions,
+                         StringRef Delimiters);
+
+/// Decides whether a file has a header file extension.
+/// Returns the file extension, if included in the provided set.
+llvm::Optional<StringRef>
+getFileExtension(StringRef FileName, const FileExtensionsSet &FileExtensions);
+
+/// Decides whether a file has one of the specified file extensions.
+bool isFileExtension(StringRef FileName,
+                     const FileExtensionsSet &FileExtensions);
+
+} // namespace utils
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_UTILS_FILE_EXTENSIONS_UTILS_H