Remove file-type tags for .cc files in ASan run-time library

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@157927 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/asan_thread.cc b/lib/asan/asan_thread.cc
index a910253..82de3d7 100644
--- a/lib/asan/asan_thread.cc
+++ b/lib/asan/asan_thread.cc
@@ -1,4 +1,4 @@
-//===-- asan_thread.cc ------------------------------------------*- C++ -*-===//
+//===-- asan_thread.cc ----------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //