disable inline ARM saturated arithmetic assembly for debug builds

Source/wtf/SaturatedArithmetic.h

 /*
  * Copyright (c) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef SaturatedArithmetic_h
 #define SaturatedArithmetic_h
 
 #include "wtf/CPU.h"
 #include <limits>
 #include <stdint.h>
 
-#if CPU(ARM) && COMPILER(GCC)
+#if CPU(ARM) && COMPILER(GCC) && __OPTIMIZE__
 
 // If we're building ARM on GCC we replace the C++ versions with some
 // native ARM assembly for speed.
 #include "wtf/asm/SaturatedArithmeticARM.h"
 
 #else
 
 ALWAYS_INLINE int32_t saturatedAddition(int32_t a, int32_t b)
 {
     uint32_t ua = a;
@@ skipping 61 matching lines @@
         std::numeric_limits<int>::max() >> FractionalShift;
 
     if (value >= intMaxForLayoutUnit)
         return std::numeric_limits<int>::max();
 
     return value << FractionalShift;
 }
 
 #endif // CPU(ARM) && COMPILER(GCC)
 #endif // SaturatedArithmetic_h