Serializer: serialize internal references via object visitor.

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 6e9f3f2f2c6be38ba7df36ebe0259a6842b4a595..d16deffca41bc73f8152123fcf000d4390e214fe 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -911,14 +911,21 @@ void RelocInfo::Verify(Isolate* isolate) {
       CHECK(code->address() == HeapObject::cast(found)->address());
       break;
     }
+    case INTERNAL_REFERENCE:
+    case INTERNAL_REFERENCE_ENCODED: {
+      Address target = target_internal_reference();
+      Address pc = target_internal_reference_address();
+      Code* code = Code::cast(isolate->FindCodeObject(pc));
+      CHECK(target >= code->instruction_start());
+      CHECK(target <= code->instruction_end());
+      break;
+    }
     case RUNTIME_ENTRY:
     case JS_RETURN:
     case COMMENT:
     case POSITION:
     case STATEMENT_POSITION:
     case EXTERNAL_REFERENCE:
-    case INTERNAL_REFERENCE:
-    case INTERNAL_REFERENCE_ENCODED:
     case DEOPT_REASON:
     case CONST_POOL:
     case VENEER_POOL: