Remove strong mode support from count 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 6f4dc275c1f636222258f228bf6d0dc423385a3f..36acfaf95870e828b9d1dc816a19fc67fd89e7c6 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -2718,9 +2718,7 @@ void BytecodeGenerator::VisitCountOperation(CountOperation* expr) {
   }
 
   // Convert old value into a number.
-  if (!is_strong(language_mode())) {
-    builder()->CastAccumulatorToNumber();
-  }
+  builder()->CastAccumulatorToNumber();
 
   // Save result for postfix expressions.
   if (is_postfix) {