[stubs] Remove N-argument Hydrogen-based Array constructor stub

src/crankshaft/x64/lithium-codegen-x64.cc

Index: src/crankshaft/x64/lithium-codegen-x64.cc
diff --git a/src/crankshaft/x64/lithium-codegen-x64.cc b/src/crankshaft/x64/lithium-codegen-x64.cc
index 0746d3b434d593e5d640504ef1e3e5d9b839e958..5763b941a1d69680ff31ed950304c56a8afa4579 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -3729,14 +3729,7 @@ void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
   DCHECK(ToRegister(instr->result()).is(rax));
 
   __ Set(rax, instr->arity());
-  if (instr->arity() == 1) {
-    // We only need the allocation site for the case we have a length argument.
-    // The case may bail out to the runtime, which will determine the correct
-    // elements kind with the site.
-    __ Move(rbx, instr->hydrogen()->site());
-  } else {
-    __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
-  }
+  __ Move(rbx, instr->hydrogen()->site());
 
   ElementsKind kind = instr->hydrogen()->elements_kind();
   AllocationSiteOverrideMode override_mode =
@@ -3770,7 +3763,7 @@ void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
     CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
     __ bind(&done);
   } else {
-    ArrayNArgumentsConstructorStub stub(isolate(), kind, override_mode);
+    ArrayNArgumentsConstructorStub stub(isolate());
     CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
   }
 }