Introduce {FAST,SLOW}_STRING_WRAPPER_ELEMENTS

src/interpreter/bytecode-array-iterator.cc

Index: src/interpreter/bytecode-array-iterator.cc
diff --git a/src/interpreter/bytecode-array-iterator.cc b/src/interpreter/bytecode-array-iterator.cc
index 47bcf0047a4cb2fd15ac74c86ce10265b62b27ea..fc9e2f5e9037615a2d18c64dd78700a682bfc219 100644
--- a/src/interpreter/bytecode-array-iterator.cc
+++ b/src/interpreter/bytecode-array-iterator.cc
@@ -133,8 +133,9 @@ int BytecodeArrayIterator::GetRegisterOperandRange(int operand_index) const {
 
 Handle<Object> BytecodeArrayIterator::GetConstantForIndexOperand(
     int operand_index) const {
-  Handle<FixedArray> constants = handle(bytecode_array()->constant_pool());
-  return FixedArray::get(constants, GetIndexOperand(operand_index));
+  return FixedArray::get(bytecode_array()->constant_pool(),
+                         GetIndexOperand(operand_index),
+                         bytecode_array()->GetIsolate());
 }