[snapshot] Print lazily deserialized builtins.

Change-Id: I0e9ad97eb55e2bd206626e1f0734a05da3ba904c
Reviewed-on: https://chromium-review.googlesource.com/934287
Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51593}

src/snapshot/builtin-deserializer.cc

@@ -109,14 +109,35 @@ void BuiltinDeserializer::DeserializeEagerBuiltinsAndHandlers() {
 Code* BuiltinDeserializer::DeserializeBuiltin(int builtin_id) {
   allocator()->ReserveAndInitializeBuiltinsTableForBuiltin(builtin_id);
   DisallowHeapAllocation no_gc;
-  return DeserializeBuiltinRaw(builtin_id);
+  Code* code = DeserializeBuiltinRaw(builtin_id);
+
+#ifdef ENABLE_DISASSEMBLER
+  if (FLAG_print_builtin_code) {
+    DCHECK(isolate()->builtins()->is_initialized());
+    OFStream os(stdout);
+    code->Disassemble(Builtins::name(builtin_id), os);
+    os << std::flush;
+  }
+#endif  // ENABLE_DISASSEMBLER
+
+  return code;
 }
 
 Code* BuiltinDeserializer::DeserializeHandler(Bytecode bytecode,
                                               OperandScale operand_scale) {
   allocator()->ReserveForHandler(bytecode, operand_scale);
   DisallowHeapAllocation no_gc;
-  return DeserializeHandlerRaw(bytecode, operand_scale);
+  Code* code = DeserializeHandlerRaw(bytecode, operand_scale);
+
+#ifdef ENABLE_DISASSEMBLER
+  if (FLAG_print_builtin_code) {
+    OFStream os(stdout);
+    code->Disassemble(Bytecodes::ToString(bytecode), os);
+    os << std::flush;
+  }
+#endif  // ENABLE_DISASSEMBLER
+
+  return code;
 }
 
 Code* BuiltinDeserializer::DeserializeBuiltinRaw(int builtin_id) {