[turbofan] Assign appropriate types to some Date builtins.

src/compiler/access-builder.cc

 // Copyright 2014 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/compiler/access-builder.h"
 
 #include "src/compiler/type-cache.h"
 #include "src/contexts.h"
 #include "src/frames.h"
 #include "src/handles-inl.h"
@@ skipping 251 matching lines @@
   FieldAccess access = {kTaggedBase,
                         JSTypedArray::kLengthOffset,
                         MaybeHandle<Name>(),
                         TypeCache::Get().kJSTypedArrayLengthType,
                         MachineType::AnyTagged(),
                         kNoWriteBarrier};
   return access;
 }
 
 // static
+FieldAccess AccessBuilder::ForJSDateValue() {
+  FieldAccess access = {kTaggedBase,
+                        JSDate::kValueOffset,
+                        MaybeHandle<Name>(),
+                        TypeCache::Get().kJSDateValueType,
+                        MachineType::AnyTagged(),
+                        kFullWriteBarrier};
+  return access;
+}
+
+// static
 FieldAccess AccessBuilder::ForJSDateField(JSDate::FieldIndex index) {
   FieldAccess access = {kTaggedBase,
                         JSDate::kValueOffset + index * kPointerSize,
                         MaybeHandle<Name>(),
                         Type::Number(),
                         MachineType::AnyTagged(),
                         kFullWriteBarrier};
   return access;
 }
 
@@ skipping 423 matching lines @@
   }
   UNREACHABLE();
   ElementAccess access = {kUntaggedBase, 0, Type::None(), MachineType::None(),
                           kNoWriteBarrier};
   return access;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8