[Interpreter] Ensure ValueOf is only called once for post-increment operations.

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index 404b9d3b59e92c9140e03d2df7abbcfa3f984f0e..43035eb3744602554fb7861a9e32b33ed80210a3 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -2750,7 +2750,9 @@ void BytecodeGenerator::VisitCountOperation(CountOperation* expr) {
   if (is_postfix) {
     // Convert old value into a number before saving it.
     old_value = register_allocator()->NewRegister();
-    builder()->ConvertAccumulatorToNumber(old_value);
+    builder()
+        ->ConvertAccumulatorToNumber(old_value)
+        .LoadAccumulatorWithRegister(old_value);

[Jarin, 2016/11/08 14:39:28]

Does not this mean that the feedback for the binop will be a bit bogus?

   }
 
   // Perform +1/-1 operation.