[sanitizer] Make file headers more conventional

Add "-*- C++ -*-"

Author: MaskRay

llvm/include/llvm/Transforms/Instrumentation/AddressSanitizer.h

@@ -1,4 +1,4 @@
-//===--------- Definition of the AddressSanitizer class ---------*- C++ -*-===//
+//===- AddressSanitizer.h - AddressSanitizer instrumentation ----*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

llvm/include/llvm/Transforms/Instrumentation/DataFlowSanitizer.h

@@ -1,4 +1,4 @@
-//===- DataFlowSanitizer.h - dynamic data flow analysis -------------------===//
+//===- DataFlowSanitizer.h - dynamic data flow analysis ---------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

llvm/include/llvm/Transforms/Instrumentation/MemorySanitizer.h

@@ -1,4 +1,4 @@
-//===- Transforms/Instrumentation/MemorySanitizer.h - MSan Pass -----------===//
+//===- MemorySanitizer.h - MemorySanitizer instrumentation ------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

llvm/include/llvm/Transforms/Instrumentation/ThreadSanitizer.h

@@ -1,4 +1,4 @@
-//===- Transforms/Instrumentation/ThreadSanitizer.h - TSan Pass -----------===//
+//===- ThreadSanitizer.h - ThreadSanitizer instrumentation ------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.