[Interpreter] Add for/while/do support to the bytecode generator.

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index 3862842277272f4ea945e7f4ce76a89a02e769ca..0e9c728781fe56701ff18cac97768e8d8d8e0dd3 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -178,6 +178,14 @@ class Bytecodes {
   // Maximum size of a bytecode and its operands.
   static int MaximumSize();
 
+  // Return true if the bytecode is a jump or a conditional jump taking
+  // an immediate byte operand (OperandType::kImm8).
+  static bool IsJump(Bytecode bytecode);
+
+  // Return true if the bytecode is a jump or conditional jump taking a
+  // constant pool entry (OperandType::kIdx).
+  static bool IsJumpConstant(Bytecode bytecode);
+
   // Decode a single bytecode and operands to |os|.
   static std::ostream& Decode(std::ostream& os, const uint8_t* bytecode_start,
                               int number_of_parameters);