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/ffsdi2.c b/lib/ffsdi2.c
index 93afc6c..680fdb3 100644
--- a/lib/ffsdi2.c
+++ b/lib/ffsdi2.c
@@ -1,20 +1,22 @@
-//===-- ffsdi2.c - Implement __ffsdi2 -------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements __ffsdi2 for the compiler_rt library.
-//
-//===----------------------------------------------------------------------===//
+/* ===-- ffsdi2.c - Implement __ffsdi2 -------------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __ffsdi2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
 
 #include "int_lib.h"
 
-// Returns: the index of the least significant 1-bit in a, or
-// the value zero if a is zero. The least significant bit is index one.
+/* Returns: the index of the least significant 1-bit in a, or
+ * the value zero if a is zero. The least significant bit is index one.
+ */
 
 si_int
 __ffsdi2(di_int a)