Implement tracking and optimizations of packed arrays

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 79b56fc077bc930918cc4b3230b31a462c534935..23fb76799ce94711bfa4943761135a2c7ad97b9c 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -2702,6 +2702,8 @@ void LCodeGen::DoLoadElements(LLoadElements* instr) {
             Map::kElementsKindBitCount);
     __ cmp(scratch, Operand(FAST_ELEMENTS));
     __ b(eq, &done);
+    __ cmp(scratch, Operand(FAST_HOLEY_ELEMENTS));
+    __ b(eq, &done);
     __ cmp(scratch, Operand(FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND));
     __ b(lt, &fail);
     __ cmp(scratch, Operand(LAST_EXTERNAL_ARRAY_ELEMENTS_KIND));
@@ -4675,8 +4677,8 @@ void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
 
   // Deopt if the array literal boilerplate ElementsKind is of a type different
   // than the expected one. The check isn't necessary if the boilerplate has
-  // already been converted to FAST_ELEMENTS.
-  if (boilerplate_elements_kind != FAST_ELEMENTS) {
+  // already been converted to TERMINAL_FAST_ELEMENTS_KIND.
+  if (boilerplate_elements_kind != TERMINAL_FAST_ELEMENTS_KIND) {
     __ LoadHeapObject(r1, instr->hydrogen()->boilerplate_object());
     // Load map into r2.
     __ ldr(r2, FieldMemOperand(r1, HeapObject::kMapOffset));