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/altera/StructPackAlignCheck.h b/linux-x64/clang/include/clang-tidy/altera/StructPackAlignCheck.h
new file mode 100644
index 0000000..510e030
--- /dev/null
+++ b/linux-x64/clang/include/clang-tidy/altera/StructPackAlignCheck.h
@@ -0,0 +1,41 @@
+//===--- StructPackAlignCheck.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_ALTERA_STRUCTPACKALIGNCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ALTERA_STRUCTPACKALIGNCHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang {
+namespace tidy {
+namespace altera {
+
+/// Finds structs that are inefficiently packed or aligned, and recommends
+/// packing and/or aligning of said structs as needed.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/altera-struct-pack-align.html
+class StructPackAlignCheck : public ClangTidyCheck {
+public:
+  StructPackAlignCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context),
+    MaxConfiguredAlignment(Options.get("MaxConfiguredAlignment", 128)) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+  void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
+
+private:
+  const unsigned MaxConfiguredAlignment;
+  CharUnits computeRecommendedAlignment(CharUnits MinByteSize);
+};
+
+} // namespace altera
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ALTERA_STRUCTPACKALIGNCHECK_H