Move LookupResult into crankshaft as that's now the only place where it's still used

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 7944d8a0fe3d17984fc77d0a6a969e30163e1f01..7d0a0eeee48774e974fa09fac3b3b6d389842b03 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5995,13 +5995,6 @@ class Map: public HeapObject {
     cache->set(kProtoTransitionNumberOfEntriesOffset, Smi::FromInt(value));
   }
 
-  // Lookup in the map's instance descriptors and fill out the result if the
-  // name is found.
-  inline void LookupDescriptor(Name* name, LookupResult* result);
-
-  inline void LookupTransition(Name* name, PropertyAttributes attributes,
-                               LookupResult* result);
-
   inline PropertyDetails GetLastDescriptorDetails();
 
   // The size of transition arrays are limited so they do not end up in large
@@ -10311,9 +10304,6 @@ class JSArray: public JSObject {
   static bool WouldChangeReadOnlyLength(Handle<JSArray> array, uint32_t index);
   static MaybeHandle<Object> ReadOnlyLengthError(Handle<JSArray> array);
 
-  // TODO(adamk): Remove this method in favor of HasReadOnlyLength().
-  static bool IsReadOnlyLengthDescriptor(Handle<Map> jsarray_map);
-
   // Initialize the array with the given capacity. The function may
   // fail due to out-of-memory situations, but only if the requested
   // capacity is non-zero.