Reland "Hydrogenisation of binops"

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index 357dcaffc5916cbc6b4b341d0ccd506c62d761f8..54ea04e7b9636f3b39d6e158c9567e7cbb50b967 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -121,6 +121,10 @@ class LCodeGen: public LCodeGenBase {
   void X87Fxch(X87Register reg, int other_slot = 0) {
     x87_stack_.Fxch(reg, other_slot);
   }
+  void X87Free(X87Register reg) {
+    x87_stack_.Free(reg);
+  }
+
 
   bool X87StackEmpty() {
     return x87_stack_.depth() == 0;