[turbofan] Set proper representation for initial arguments length.

src/compiler/access-builder.cc

Index: src/compiler/access-builder.cc
diff --git a/src/compiler/access-builder.cc b/src/compiler/access-builder.cc
index 11925a84db14bcad258b6ebc8e25ae4d855fbae8..0a58bcdb6a41a953f3c57980241bbb6934c8a22c 100644
--- a/src/compiler/access-builder.cc
+++ b/src/compiler/access-builder.cc
@@ -716,8 +716,8 @@ FieldAccess AccessBuilder::ForValue() {
 FieldAccess AccessBuilder::ForArgumentsLength() {
   FieldAccess access = {kTaggedBase,         JSArgumentsObject::kLengthOffset,
                         Handle<Name>(),      MaybeHandle<Map>(),
-                        Type::NonInternal(), MachineType::AnyTagged(),
-                        kFullWriteBarrier};
+                        Type::SignedSmall(), MachineType::TaggedSigned(),
+                        kNoWriteBarrier};
   return access;
 }