[crankshaft] Allow inlining of base constructors

src/crankshaft/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 8370 matching lines @@
   // Use the same AstValueFactory for creating strings in the sub-compilation
   // step, but don't transfer ownership to target_info.
   ParseInfo parse_info(zone(), target);
   parse_info.set_ast_value_factory(
       top_info()->parse_info()->ast_value_factory());
   parse_info.set_ast_value_factory_owned(false);
 
   CompilationInfo target_info(&parse_info);
   Handle<SharedFunctionInfo> target_shared(target->shared());
 
-  if (IsClassConstructor(target_shared->kind())) {
+  if (inlining_kind != CONSTRUCT_CALL_RETURN &&
+      IsClassConstructor(target_shared->kind())) {
     TraceInline(target, caller, "target is classConstructor");
     return false;
   }
+
   if (target_shared->HasDebugInfo()) {
     TraceInline(target, caller, "target is being debugged");
     return false;
   }
   if (!Compiler::ParseAndAnalyze(target_info.parse_info())) {
     if (target_info.isolate()->has_pending_exception()) {
       // Parse or scope error, never optimize this function.
       SetStackOverflow();
       target_shared->DisableOptimization(kParseScopeError);
     }
@@ skipping 1491 matching lines @@
 
   int args_to_drop = argument_count + (expression->IsCall() ? 2 : 1);
   Drop(args_to_drop);
   ast_context()->ReturnValue(new_object);
 }
 
 
 // Checks whether allocation using the given constructor can be inlined.
 static bool IsAllocationInlineable(Handle<JSFunction> constructor) {
   return constructor->has_initial_map() &&
-         !IsClassConstructor(constructor->shared()->kind()) &&
+         !IsSubclassConstructor(constructor->shared()->kind()) &&
          constructor->initial_map()->instance_type() == JS_OBJECT_TYPE &&
          constructor->initial_map()->instance_size() <
              HAllocate::kMaxInlineSize;
 }
 
 
 bool HOptimizedGraphBuilder::IsCallArrayInlineable(
     int argument_count,
     Handle<AllocationSite> site) {
   Handle<JSFunction> caller = current_info()->closure();
@@ skipping 3738 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8