Implement tracking and optimizations of packed arrays

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 9f448720cc53549aaaf130d4925ef942fd18c01e..8b60be6c354688fd55ba98e16b59ac8fb9374a3f 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -1701,7 +1701,7 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
   ASSERT_EQ(2, constant_elements->length());
   ElementsKind constant_elements_kind =
       static_cast<ElementsKind>(Smi::cast(constant_elements->get(0))->value());
-  bool has_fast_elements = constant_elements_kind == FAST_ELEMENTS;
+  bool has_fast_elements = IsFastObjectElementsKind(constant_elements_kind);
   Handle<FixedArrayBase> constant_elements_values(
       FixedArrayBase::cast(constant_elements->get(1)));
 
@@ -1722,8 +1722,7 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
   } else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) {
     __ CallRuntime(Runtime::kCreateArrayLiteralShallow, 3);
   } else {
-    ASSERT(constant_elements_kind == FAST_ELEMENTS ||
-           constant_elements_kind == FAST_SMI_ONLY_ELEMENTS ||
+    ASSERT(IsFastSmiOrObjectElementsKind(constant_elements_kind) ||
            FLAG_smi_only_arrays);
     FastCloneShallowArrayStub::Mode mode = has_fast_elements
       ? FastCloneShallowArrayStub::CLONE_ELEMENTS
@@ -1751,7 +1750,7 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
     }
     VisitForAccumulatorValue(subexpr);
 
-    if (constant_elements_kind == FAST_ELEMENTS) {
+    if (IsFastObjectElementsKind(constant_elements_kind)) {
       int offset = FixedArray::kHeaderSize + (i * kPointerSize);
       __ ldr(r6, MemOperand(sp));  // Copy of array literal.
       __ ldr(r1, FieldMemOperand(r6, JSObject::kElementsOffset));