[Interpreter] Add support for for count operations.

src/interpreter/bytecode-array-builder.h

Index: src/interpreter/bytecode-array-builder.h
diff --git a/src/interpreter/bytecode-array-builder.h b/src/interpreter/bytecode-array-builder.h
index 079327d99b2ff8a4b97bac01fc496bb34c711081..2ab4c8fc2abeb4d58a1a261bdc15e441e70395cc 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -131,6 +131,9 @@ class BytecodeArrayBuilder {
   BytecodeArrayBuilder& BinaryOperation(Token::Value binop, Register reg,
                                         Strength strength);
 
+  // Count Operators (value stored in accumulator).
+  BytecodeArrayBuilder& CountOperation(Token::Value op, Strength strength);
+
   // Unary Operators.
   BytecodeArrayBuilder& LogicalNot();
   BytecodeArrayBuilder& TypeOf();
@@ -142,6 +145,7 @@ class BytecodeArrayBuilder {
   // Casts
   BytecodeArrayBuilder& CastAccumulatorToBoolean();
   BytecodeArrayBuilder& CastAccumulatorToName();
+  BytecodeArrayBuilder& CastAccumulatorToNumber();
 
   // Flow Control.
   BytecodeArrayBuilder& Bind(BytecodeLabel* label);
@@ -169,6 +173,7 @@ class BytecodeArrayBuilder {
   Isolate* isolate() const { return isolate_; }
 
   static Bytecode BytecodeForBinaryOperation(Token::Value op);
+  static Bytecode BytecodeForCountOperation(Token::Value op);
   static Bytecode BytecodeForCompareOperation(Token::Value op);
   static Bytecode BytecodeForLoadIC(LanguageMode language_mode);
   static Bytecode BytecodeForKeyedLoadIC(LanguageMode language_mode);