[turbofan] avoid xchg instruction on Intel

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 867153ba03569e5c47df5ae437355f93bfd663c3..6e597e2814cfd57665c55eb403871305350b1848 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -3341,7 +3341,9 @@ void CompareICStub::GenerateBooleans(MacroAssembler* masm) {
       __ AssertSmi(eax);
       __ mov(edx, FieldOperand(edx, Oddball::kToNumberOffset));
       __ AssertSmi(edx);
-      __ xchg(eax, edx);
+      __ push(eax);
+      __ mov(eax, edx);
+      __ pop(edx);
     }
     __ sub(eax, edx);
     __ Ret();