[interpreter] Add constant_pool() to BytecodeArray.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 93da2ed3874960606958888ae0255eaf00745a4a..35a7e48e46133db7ed4e68ac2dfdcb03612b5a77 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -225,6 +225,8 @@ void ByteArray::ByteArrayVerify() {
 void BytecodeArray::BytecodeArrayVerify() {
   // TODO(oth): Walk bytecodes and immediate values to validate sanity.
   CHECK(IsBytecodeArray());
+  CHECK(constant_pool()->IsFixedArray());
+  VerifyHeapPointer(constant_pool());
 }