Revert of Remove ExternalArray, derived types, and element kinds

src/elements-kind.h

Index: src/elements-kind.h
diff --git a/src/elements-kind.h b/src/elements-kind.h
index 0254a4fb59b20e44096138e54458840ba5253d26..c3184b93835313d30efc4f12051ceec49b47053e 100644
--- a/src/elements-kind.h
+++ b/src/elements-kind.h
@@ -32,6 +32,17 @@
 
   FAST_SLOPPY_ARGUMENTS_ELEMENTS,
   SLOW_SLOPPY_ARGUMENTS_ELEMENTS,
+
+  // The "fast" kind for external arrays
+  EXTERNAL_INT8_ELEMENTS,
+  EXTERNAL_UINT8_ELEMENTS,
+  EXTERNAL_INT16_ELEMENTS,
+  EXTERNAL_UINT16_ELEMENTS,
+  EXTERNAL_INT32_ELEMENTS,
+  EXTERNAL_UINT32_ELEMENTS,
+  EXTERNAL_FLOAT32_ELEMENTS,
+  EXTERNAL_FLOAT64_ELEMENTS,
+  EXTERNAL_UINT8_CLAMPED_ELEMENTS,
 
   // Fixed typed arrays
   UINT8_ELEMENTS,
@@ -49,6 +60,8 @@
   LAST_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
   FIRST_FAST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
   LAST_FAST_ELEMENTS_KIND = FAST_HOLEY_DOUBLE_ELEMENTS,
+  FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_INT8_ELEMENTS,
+  LAST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_UINT8_CLAMPED_ELEMENTS,
   FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_ELEMENTS,
   LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
   TERMINAL_FAST_ELEMENTS_KIND = FAST_HOLEY_ELEMENTS
@@ -84,15 +97,21 @@
 }
 
 
+inline bool IsExternalArrayElementsKind(ElementsKind kind) {
+  return kind >= FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND &&
+      kind <= LAST_EXTERNAL_ARRAY_ELEMENTS_KIND;
+}
+
+
+inline bool IsTerminalElementsKind(ElementsKind kind) {
+  return kind == TERMINAL_FAST_ELEMENTS_KIND ||
+      IsExternalArrayElementsKind(kind);
+}
+
+
 inline bool IsFixedTypedArrayElementsKind(ElementsKind kind) {
   return kind >= FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND &&
-         kind <= LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND;
-}
-
-
-inline bool IsTerminalElementsKind(ElementsKind kind) {
-  return kind == TERMINAL_FAST_ELEMENTS_KIND ||
-         IsFixedTypedArrayElementsKind(kind);
+      kind <= LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND;
 }
 
 
@@ -114,13 +133,21 @@
 }
 
 
+inline bool IsExternalFloatOrDoubleElementsKind(ElementsKind kind) {
+  return kind == EXTERNAL_FLOAT64_ELEMENTS ||
+      kind == EXTERNAL_FLOAT32_ELEMENTS;
+}
+
+
 inline bool IsFixedFloatElementsKind(ElementsKind kind) {
   return kind == FLOAT32_ELEMENTS || kind == FLOAT64_ELEMENTS;
 }
 
 
 inline bool IsDoubleOrFloatElementsKind(ElementsKind kind) {
-  return IsFastDoubleElementsKind(kind) || IsFixedFloatElementsKind(kind);
+  return IsFastDoubleElementsKind(kind) ||
+      IsExternalFloatOrDoubleElementsKind(kind) ||
+      IsFixedFloatElementsKind(kind);
 }