[interpreter] Add ability to preserve bytecode.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index fe4438d246cb5668d5bdb59c245e89ccbb5ba9da..79ac617c22b6aae2119b1a2f9a43258bab53f163 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -6105,6 +6105,9 @@ void SharedFunctionInfo::ReplaceCode(Code* value) {
   if (is_compiled()) set_never_compiled(false);
 }
 
+bool SharedFunctionInfo::HasBaselineCode() const {
+  return code()->kind() == Code::FUNCTION;
+}
 
 ScopeInfo* SharedFunctionInfo::scope_info() const {
   return reinterpret_cast<ScopeInfo*>(READ_FIELD(this, kScopeInfoOffset));
@@ -6121,8 +6124,7 @@ void SharedFunctionInfo::set_scope_info(ScopeInfo* value,
                             mode);
 }
 
-
-bool SharedFunctionInfo::is_compiled() {
+bool SharedFunctionInfo::is_compiled() const {
   Builtins* builtins = GetIsolate()->builtins();
   DCHECK(code() != builtins->builtin(Builtins::kCompileOptimizedConcurrent));
   DCHECK(code() != builtins->builtin(Builtins::kCompileOptimized));
@@ -6151,7 +6153,7 @@ DebugInfo* SharedFunctionInfo::GetDebugInfo() {
 
 bool SharedFunctionInfo::HasDebugCode() {
   return HasBytecodeArray() ||
-         (code()->kind() == Code::FUNCTION && code()->has_debug_break_slots());
+         (HasBaselineCode() && code()->has_debug_break_slots());
 }