Code style and Readability fixes. Credit to Craig van Vliet.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@78403 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/addvdi3.c b/lib/addvdi3.c
index 88436e8..8b885f5 100644
--- a/lib/addvdi3.c
+++ b/lib/addvdi3.c
@@ -1,22 +1,23 @@
-//===-- addvdi3.c - Implement __addvdi3 -----------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements __addvdi3 for the compiler_rt library.
-//
-//===----------------------------------------------------------------------===//
+/* ===-- addvdi3.c - Implement __addvdi3 -----------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __addvdi3 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
 
 #include "int_lib.h"
 #include <stdlib.h>
 
-// Returns: a + b
+/* Returns: a + b */
 
-// Effects: aborts if a + b overflows
+/* Effects: aborts if a + b overflows */
 
 di_int
 __addvdi3(di_int a, di_int b)