[Interpreter] Add BytecodeArray class and add to SharedFunctionInfo.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 4660a67dd2847e668ca305a780bc8e80a2482488..18e5ecd6642c75b6a56f37c3746421e939a5dc43 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -3044,6 +3044,12 @@ bool Heap::CreateInitialMaps() {
       ByteArray* byte_array;
       if (!AllocateByteArray(0, TENURED).To(&byte_array)) return false;
       set_empty_byte_array(byte_array);
+
+      BytecodeArray* bytecode_array;
+      if (!AllocateBytecodeArray(0, nullptr, TENURED).To(&bytecode_array)) {
+        return false;
+      }
+      set_empty_bytecode_array(bytecode_array);
     }
 
 #define ALLOCATE_EMPTY_EXTERNAL_ARRAY(Type, type, TYPE, ctype, size)  \
@@ -3786,6 +3792,28 @@ AllocationResult Heap::AllocateByteArray(int length, PretenureFlag pretenure) {
 }
 
 
+AllocationResult Heap::AllocateBytecodeArray(int length,
+                                             const byte* const start,
+                                             PretenureFlag pretenure) {
+  if (length < 0 || length > BytecodeArray::kMaxLength) {
+    v8::internal::Heap::FatalProcessOutOfMemory("invalid array length", true);
+  }
+  int size = BytecodeArray::SizeFor(length);
+  AllocationSpace space = SelectSpace(size, pretenure);
+  HeapObject* result;
+  {
+    AllocationResult allocation = AllocateRaw(size, space, OLD_SPACE);
+    if (!allocation.To(&result)) return allocation;
+  }
+
+  BytecodeArray* instance = BytecodeArray::cast(result);
+  instance->set_length(length);
+  CopyBytes(instance->GetDataStartAddress(), start, length);
+  result->set_map_no_write_barrier(byte_array_map());
+  return result;
+}
+
+
 void Heap::CreateFillerObjectAt(Address addr, int size) {
   if (size == 0) return;
   HeapObject* filler = HeapObject::FromAddress(addr);