Compile FastCloneShallowObjectStub using Crankshaft.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index ecc92c762443fdfc7ed1259e31c7a0b0ad2a8527..8121cb2c8d3a748467b8bd4d5f12e03c63aca3f4 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -1552,24 +1552,34 @@ void FullCodeGenerator::EmitAccessor(Expression* expression) {
 void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
   Comment cmnt(masm_, "[ ObjectLiteral");
   Handle<FixedArray> constant_properties = expr->constant_properties();
-  __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
-  __ push(FieldOperand(rdi, JSFunction::kLiteralsOffset));
-  __ Push(Smi::FromInt(expr->literal_index()));
-  __ Push(constant_properties);
   int flags = expr->fast_elements()
       ? ObjectLiteral::kFastElements
       : ObjectLiteral::kNoFlags;
   flags |= expr->has_function()
       ? ObjectLiteral::kHasFunction
       : ObjectLiteral::kNoFlags;
-  __ Push(Smi::FromInt(flags));
   int properties_count = constant_properties->length() / 2;
   if (expr->depth() > 1) {
+    __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
+    __ push(FieldOperand(rdi, JSFunction::kLiteralsOffset));
+    __ Push(Smi::FromInt(expr->literal_index()));
+    __ Push(constant_properties);
+    __ Push(Smi::FromInt(flags));
     __ CallRuntime(Runtime::kCreateObjectLiteral, 4);
-  } else if (flags != ObjectLiteral::kFastElements ||
+  } else if (Serializer::enabled() || flags != ObjectLiteral::kFastElements ||
       properties_count > FastCloneShallowObjectStub::kMaximumClonedProperties) {
+    __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
+    __ push(FieldOperand(rdi, JSFunction::kLiteralsOffset));
+    __ Push(Smi::FromInt(expr->literal_index()));
+    __ Push(constant_properties);
+    __ Push(Smi::FromInt(flags));
     __ CallRuntime(Runtime::kCreateObjectLiteralShallow, 4);
   } else {
+    __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
+    __ movq(rax, FieldOperand(rdi, JSFunction::kLiteralsOffset));
+    __ Move(rbx, Smi::FromInt(expr->literal_index()));
+    __ Move(rcx, constant_properties);
+    __ Move(rdx, Smi::FromInt(flags));
     FastCloneShallowObjectStub stub(properties_count);
     __ CallStub(&stub);
   }