Hydrogen stubs for array constructors

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 5e3e426042a63d8912827bd1f033fbe95370d174..dad70b3c33fe07cf7e448808a0ac36dac675e8d7 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2556,6 +2556,8 @@ void LCodeGen::DoReturn(LReturn* instr) {
            rcx);
   } else {
     Register reg = ToRegister(instr->parameter_count());
+    // The argument count parameter is a smi
+    __ SmiToInteger32(reg, reg);
     Register return_addr_reg = reg.is(rcx) ? rbx : rcx;
     __ pop(return_addr_reg);
     __ shl(reg, Immediate(kPointerSizeLog2));
@@ -3912,9 +3914,18 @@ void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
 
   __ Set(rax, instr->arity());
   __ Move(rbx, instr->hydrogen()->property_cell());
-  Handle<Code> array_construct_code =
-      isolate()->builtins()->ArrayConstructCode();
-  CallCode(array_construct_code, RelocInfo::CONSTRUCT_CALL, instr);
+  Object* cell_value = instr->hydrogen()->property_cell()->value();
+  ElementsKind kind = static_cast<ElementsKind>(Smi::cast(cell_value)->value());
+  if (instr->arity() == 0) {
+    ArrayNoArgumentConstructorStub stub(kind);
+    CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
+  } else if (instr->arity() == 1) {
+    ArraySingleArgumentConstructorStub stub(kind);
+    CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
+  } else {
+    ArrayNArgumentsConstructorStub stub(kind);
+    CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
+  }
 }