Revert of Remove ExternalArray, derived types, and element kinds

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 49747b7751889eb60e72e38572c95da567bcf358..ad34013a2a92391aea36c4e2a1fd694bc3de698e 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -2240,7 +2240,7 @@
   LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LInstruction* result = NULL;
 
-  if (!instr->is_fixed_typed_array()) {
+  if (!instr->is_typed_elements()) {
     LOperand* obj = NULL;
     if (instr->representation().IsDouble()) {
       obj = UseRegister(instr->elements());
@@ -2260,9 +2260,10 @@
   }
 
   bool needs_environment;
-  if (instr->is_fixed_typed_array()) {
+  if (instr->is_external() || instr->is_fixed_typed_array()) {
     // see LCodeGen::DoLoadKeyedExternalArray
-    needs_environment = elements_kind == UINT32_ELEMENTS &&
+    needs_environment = (elements_kind == EXTERNAL_UINT32_ELEMENTS ||
+                         elements_kind == UINT32_ELEMENTS) &&
                         !instr->CheckFlag(HInstruction::kUint32);
   } else {
     // see LCodeGen::DoLoadKeyedFixedDoubleArray and
@@ -2297,7 +2298,7 @@
 
 
 LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
-  if (!instr->is_fixed_typed_array()) {
+  if (!instr->is_typed_elements()) {
     DCHECK(instr->elements()->representation().IsTagged());
     bool needs_write_barrier = instr->NeedsWriteBarrier();
     LOperand* object = NULL;