Fix incorrectly disabled SSE2 WebAudio optimizations for Windows.

Source/platform/audio/SincResampler.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 15 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #if ENABLE(WEB_AUDIO)
 
 #include "platform/audio/SincResampler.h"
 
 #include "platform/audio/AudioBus.h"
+#include "wtf/CPU.h"
 #include "wtf/MathExtras.h"
 
-#ifdef __SSE2__
+#if CPU(X86) || CPU(X86_64)
 #include <emmintrin.h>
 #endif
 
 using namespace std;
 
 // Input buffer layout, dividing the total buffer into regions (r0 - r5):
 //
 // |----------------|----------------------------------------------------------------|----------------|
 //
 //                                              blockSize + kernelSize / 2
@@ skipping 206 matching lines @@
 #define CONVOLVE_ONE_SAMPLE      \
             input = *inputP++;   \
             sum1 += input * *k1; \
             sum2 += input * *k2; \
             ++k1;                \
             ++k2;
 
             {
                 float input;
 
-#ifdef __SSE2__
+#if CPU(X86) || CPU(X86_64)
                 // If the sourceP address is not 16-byte aligned, the first several frames (at most three) should be processed seperately.
                 while ((reinterpret_cast<uintptr_t>(inputP) & 0x0F) && n) {
                     CONVOLVE_ONE_SAMPLE
                     n--;
                 }
 
                 // Now the inputP is aligned and start to apply SSE.
                 float* endP = inputP + n - n % 4;
                 __m128 mInput;
                 __m128 mK1;
@@ skipping 189 matching lines @@
 
         // Step (4)
         // Refresh the buffer with more input.
         consumeSource(r5, m_blockSize);
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)