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

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

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index 83a86303afc6d02d3f9c8b6ca16a0b58a8895bc3..945e99d092c96d6339269313c856db57343c6aaa 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -990,7 +990,7 @@ void CodeGenerator::AssembleSwap(InstructionOperand* source,
     __ 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);