Fixup C++ style comments are not allowed in ISO C90 to classic C style.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@78152 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/clzdi2.c b/lib/clzdi2.c
index 7e58a5a..34d4362 100644
--- a/lib/clzdi2.c
+++ b/lib/clzdi2.c
@@ -1,21 +1,22 @@
-//===-- clzdi2.c - Implement __clzdi2 -------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements __clzdi2 for the compiler_rt library.
-//
-//===----------------------------------------------------------------------===//
+/* ===-- clzdi2.c - Implement __clzdi2 -------------------------------------===
+ *
+ *      	       The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __clzdi2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
 
 #include "int_lib.h"
 
-// Returns: the number of leading 0-bits
+/* Returns: the number of leading 0-bits */
 
-// Precondition: a != 0
+/* Precondition: a != 0 */
 
 si_int
 __clzdi2(di_int a)