Return the original value when assigning to a pixel array

src/ia32/ic-ia32.cc

Index: src/ia32/ic-ia32.cc
===================================================================
--- src/ia32/ic-ia32.cc	(revision 2984)
+++ src/ia32/ic-ia32.cc	(working copy)
@@ -421,6 +421,7 @@
   __ sar(ebx, kSmiTagSize);  // Untag the index.
   __ cmp(ebx, FieldOperand(ecx, PixelArray::kLengthOffset));
   __ j(above_equal, &slow);
+  __ mov(edx, eax);  // Save the value.
   __ sar(eax, kSmiTagSize);  // Untag the value.
   {  // Clamp the value to [0..255].
     Label done, check_255;
@@ -436,6 +437,7 @@
   }
   __ mov(ecx, FieldOperand(ecx, PixelArray::kExternalPointerOffset));
   __ mov_b(Operand(ecx, ebx, times_1, 0), eax);
+  __ mov(eax, edx);  // Return the original value.
   __ ret(0);
 
   // Extra capacity case: Check if there is extra capacity to