[turbofan] Initial support for monomorphic/polymorphic property loads.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 61247426495e9666410fb8fd2c4ba79131a8500b..1967107a9dd1d0313e8ed49695fa012e5e556028 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4905,6 +4905,7 @@ bool Map::IsJSGlobalProxyMap() {
 bool Map::IsJSGlobalObjectMap() {
   return instance_type() == JS_GLOBAL_OBJECT_TYPE;
 }
+bool Map::IsJSTypedArrayMap() { return instance_type() == JS_TYPED_ARRAY_TYPE; }
 bool Map::IsGlobalObjectMap() {
   const InstanceType type = instance_type();
   return type == JS_GLOBAL_OBJECT_TYPE || type == JS_BUILTINS_OBJECT_TYPE;