[Interpreter] Add BytecodeArray class and add to SharedFunctionInfo.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index a3d96b9d034228462a36c559c43a4bcdc21645ba..5dd8ec4a856dcb52685535a138425c98ee297048 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -70,6 +70,9 @@ void HeapObject::HeapObjectVerify() {
     case BYTE_ARRAY_TYPE:
       ByteArray::cast(this)->ByteArrayVerify();
       break;
+    case BYTECODE_ARRAY_TYPE:
+      BytecodeArray::cast(this)->BytecodeArrayVerify();
+      break;
     case FREE_SPACE_TYPE:
       FreeSpace::cast(this)->FreeSpaceVerify();
       break;
@@ -222,6 +225,12 @@ void ByteArray::ByteArrayVerify() {
 }
 
 
+void BytecodeArray::BytecodeArrayVerify() {
+  // TODO(oth): Walk bytecodes and immediate values to validate sanity.
+  CHECK(IsBytecodeArray());
+}
+
+
 void FreeSpace::FreeSpaceVerify() {
   CHECK(IsFreeSpace());
 }