Merge 106864 - zvmul incorrectly multiplies complex arrays on Windows.

Source/WebCore/platform/audio/VectorMath.cpp

Index: Source/WebCore/platform/audio/VectorMath.cpp
===================================================================
--- Source/WebCore/platform/audio/VectorMath.cpp	(revision 106870)
+++ Source/WebCore/platform/audio/VectorMath.cpp	(working copy)
@@ -418,8 +418,13 @@
     }
 #endif
     for (; i < framesToProcess; ++i) {
-        realDestP[i] = real1P[i] * real2P[i] - imag1P[i] * imag2P[i];
-        imagDestP[i] = real1P[i] * imag2P[i] + imag1P[i] * real2P[i];
+        // Read and compute result before storing them, in case the
+        // destination is the same as one of the sources.
+        float realResult = real1P[i] * real2P[i] - imag1P[i] * imag2P[i];
+        float imagResult = real1P[i] * imag2P[i] + imag1P[i] * real2P[i];
+
+        realDestP[i] = realResult;
+        imagDestP[i] = imagResult;
     }
 }