[turbofan] Initial support for the %_DateField intrinsic.

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 c03b787aa4005eefca057f601425f013d444c1e8..a28075c24c35940d9d42f1e1037a9d962c8a402a 100644
--- a/src/compiler/access-builder.cc
+++ b/src/compiler/access-builder.cc
@@ -45,6 +45,13 @@ FieldAccess AccessBuilder::ForJSArrayBufferBackingStore() {
 
 
 // static
+FieldAccess AccessBuilder::ForJSDateField(JSDate::FieldIndex index) {
+  return {kTaggedBase, JSDate::kValueOffset + index * kPointerSize,
+          MaybeHandle<Name>(), Type::Number(), kMachAnyTagged};
+}
+
+
+// static
 FieldAccess AccessBuilder::ForFixedArrayLength() {
   // TODO(turbofan): 2^30 is a valid upper limit for the FixedArray::length
   // field, although it's not the best. If we had a Zone we could create an