Next batch of C++ to C comment style changes. Also improve and factor out endianness pre-processor code.

llvm-svn: 78226
diff --git a/compiler-rt/lib/fixunsxfsi.c b/compiler-rt/lib/fixunsxfsi.c
index 2c186a6..a711a26 100644
--- a/compiler-rt/lib/fixunsxfsi.c
+++ b/compiler-rt/lib/fixunsxfsi.c
@@ -1,30 +1,34 @@
-//===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements __fixunsxfsi for the compiler_rt library.
-//
-//===----------------------------------------------------------------------===//
+/* ===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __fixunsxfsi for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
 
 #if !_ARCH_PPC
 
 #include "int_lib.h"
 
-// Returns: convert a to a unsigned int, rounding toward zero.
-//          Negative values all become zero.
+/* Returns: convert a to a unsigned int, rounding toward zero.
+ *          Negative values all become zero.
+ */
 
-// Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
-//             su_int is a 32 bit integral type
-//             value in long double is representable in su_int or is negative 
-//                 (no range checking performed)
+/* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
+ *             su_int is a 32 bit integral type
+ *             value in long double is representable in su_int or is negative 
+ *                 (no range checking performed)
+ */
 
-// gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
-// 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
+/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
+ * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
+ */
 
 su_int
 __fixunsxfsi(long double a)