Revert "Reland 21774: Generate KeyedLoadGeneric with Hydrogen"

src/field-index.h

Index: src/field-index.h
diff --git a/src/field-index.h b/src/field-index.h
index 0f77c8c57e4481299ed83bd6c469c4dea5d20353..d7707648572ca922d09428a1adcdf08d81eac4c3 100644
--- a/src/field-index.h
+++ b/src/field-index.h
@@ -26,7 +26,9 @@ class FieldIndex V8_FINAL {
   static FieldIndex ForLookupResult(const LookupResult* result);
   static FieldIndex ForDescriptor(Map* map, int descriptor_index);
   static FieldIndex ForLoadByFieldIndex(Map* map, int index);
-  static FieldIndex ForKeyedLookupCacheIndex(Map* map, int index);
+  static FieldIndex ForKeyedLookupCacheIndex(Map* map, int index) {
+    return ForPropertyIndex(map, index);
+  }
 
   bool is_inobject() const {
     return IsInObjectBits::decode(bit_field_);
@@ -73,7 +75,9 @@ class FieldIndex V8_FINAL {
     return is_double() ? (result | 1) : result;
   }
 
-  int GetKeyedLookupCacheIndex() const;
+  int GetKeyedLookupCacheIndex() const {
+    return property_index();
+  }
 
   int GetLoadFieldStubKey() const {
     return bit_field_ &