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

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index ea1b4644f2a3fa4bb4c57304601347cfc0509318..628e7e07b69b1ae2ec4560e6c41058d2abdd58c5 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -832,11 +832,10 @@ Reduction JSTypedLowering::ReduceJSLoadProperty(Node* node) {
       size_t const k = ElementSizeLog2Of(access.machine_type());
       double const byte_length = array->byte_length()->Number();
       CHECK_LT(k, arraysize(shifted_int32_ranges_));
-      if (IsExternalArrayElementsKind(array->map()->elements_kind()) &&
-          key_type->Is(shifted_int32_ranges_[k]) && byte_length <= kMaxInt) {
+      if (key_type->Is(shifted_int32_ranges_[k]) && byte_length <= kMaxInt) {
         // JSLoadProperty(typed-array, int32)
-        Handle<ExternalArray> elements =
-            Handle<ExternalArray>::cast(handle(array->elements()));
+        Handle<FixedTypedArrayBase> elements =
+            Handle<FixedTypedArrayBase>::cast(handle(array->elements()));
         Node* buffer = jsgraph()->PointerConstant(elements->external_pointer());
         Node* length = jsgraph()->Constant(byte_length);
         Node* effect = NodeProperties::GetEffectInput(node);
@@ -879,12 +878,11 @@ Reduction JSTypedLowering::ReduceJSStoreProperty(Node* node) {
       size_t const k = ElementSizeLog2Of(access.machine_type());
       double const byte_length = array->byte_length()->Number();
       CHECK_LT(k, arraysize(shifted_int32_ranges_));
-      if (IsExternalArrayElementsKind(array->map()->elements_kind()) &&
-          access.external_array_type() != kExternalUint8ClampedArray &&
+      if (access.external_array_type() != kExternalUint8ClampedArray &&
           key_type->Is(shifted_int32_ranges_[k]) && byte_length <= kMaxInt) {
         // JSLoadProperty(typed-array, int32)
-        Handle<ExternalArray> elements =
-            Handle<ExternalArray>::cast(handle(array->elements()));
+        Handle<FixedTypedArrayBase> elements =
+            Handle<FixedTypedArrayBase>::cast(handle(array->elements()));
         Node* buffer = jsgraph()->PointerConstant(elements->external_pointer());
         Node* length = jsgraph()->Constant(byte_length);
         Node* context = NodeProperties::GetContextInput(node);