Reland of "Remove ExternalArray, derived types, and element kinds"

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 9c15d394c1fc6f947b2e13c157f50f123ad5aaf0..82a5ef5a7182a63d479916c600a75e78746a09e4 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -2184,7 +2184,7 @@ LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
   LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LInstruction* result = NULL;
 
-  if (!instr->is_typed_elements()) {
+  if (!instr->is_fixed_typed_array()) {
     LOperand* obj = NULL;
     if (instr->representation().IsDouble()) {
       obj = UseRegister(instr->elements());
@@ -2204,10 +2204,9 @@ LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
   }
 
   bool needs_environment;
-  if (instr->is_external() || instr->is_fixed_typed_array()) {
+  if (instr->is_fixed_typed_array()) {
     // see LCodeGen::DoLoadKeyedExternalArray
-    needs_environment = (elements_kind == EXTERNAL_UINT32_ELEMENTS ||
-                         elements_kind == UINT32_ELEMENTS) &&
+    needs_environment = elements_kind == UINT32_ELEMENTS &&
                         !instr->CheckFlag(HInstruction::kUint32);
   } else {
     // see LCodeGen::DoLoadKeyedFixedDoubleArray and
@@ -2242,7 +2241,7 @@ LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
 
 
 LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
-  if (!instr->is_typed_elements()) {
+  if (!instr->is_fixed_typed_array()) {
     DCHECK(instr->elements()->representation().IsTagged());
     bool needs_write_barrier = instr->NeedsWriteBarrier();
     LOperand* object = NULL;