Revert of Remove ExternalArray, derived types, and element kinds

src/ppc/lithium-ppc.h

Index: src/ppc/lithium-ppc.h
diff --git a/src/ppc/lithium-ppc.h b/src/ppc/lithium-ppc.h
index dbf980321e0a96e3c01e5f554e13184d810d0e53..f2426d0d550d0039135951c17b30eed3dac32fae 100644
--- a/src/ppc/lithium-ppc.h
+++ b/src/ppc/lithium-ppc.h
@@ -1587,8 +1587,12 @@
   LOperand* elements() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
   ElementsKind elements_kind() const { return hydrogen()->elements_kind(); }
+  bool is_external() const { return hydrogen()->is_external(); }
   bool is_fixed_typed_array() const {
     return hydrogen()->is_fixed_typed_array();
+  }
+  bool is_typed_elements() const {
+    return is_external() || is_fixed_typed_array();
   }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadKeyed, "load-keyed")
@@ -2164,8 +2168,12 @@
     inputs_[2] = value;
   }
 
+  bool is_external() const { return hydrogen()->is_external(); }
   bool is_fixed_typed_array() const {
     return hydrogen()->is_fixed_typed_array();
+  }
+  bool is_typed_elements() const {
+    return is_external() || is_fixed_typed_array();
   }
   LOperand* elements() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }