[turbofan] Fix typo in IA-32 code generator.

src/compiler/ia32/code-generator-ia32.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 972 matching lines @@
     __ pop(dst);
     __ pop(src);
   } else if (source->IsDoubleRegister() && destination->IsDoubleRegister()) {
     // XMM register-register swap. We rely on having xmm0
     // available as a fixed scratch register.
     XMMRegister src = g.ToDoubleRegister(source);
     XMMRegister dst = g.ToDoubleRegister(destination);
     __ movaps(xmm0, src);
     __ movaps(src, dst);
     __ movaps(dst, xmm0);
-  } else if (source->IsDoubleRegister() && source->IsDoubleStackSlot()) {
+  } else if (source->IsDoubleRegister() && destination->IsDoubleStackSlot()) {
     // XMM register-memory swap.  We rely on having xmm0
     // available as a fixed scratch register.
     XMMRegister reg = g.ToDoubleRegister(source);
     Operand other = g.ToOperand(destination);
     __ movsd(xmm0, other);
     __ movsd(other, reg);
     __ movaps(reg, xmm0);
   } else if (source->IsDoubleStackSlot() && destination->IsDoubleStackSlot()) {
     // Double-width memory-to-memory.
     Operand src0 = g.ToOperand(source);
@@ skipping 28 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8