Revert of Remove ExternalArray, derived types, and element kinds

src/arm64/lithium-codegen-arm64.cc

Index: src/arm64/lithium-codegen-arm64.cc
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index 5502e7beaf7d2a27a448069e05a074bc9fa96edf..cac7f92ec78beb37a57c128d17082dc721dc5f35 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -3458,33 +3458,42 @@
                                        elements_kind,
                                        instr->base_offset());
 
-  if (elements_kind == FLOAT32_ELEMENTS) {
+  if ((elements_kind == EXTERNAL_FLOAT32_ELEMENTS) ||
+      (elements_kind == FLOAT32_ELEMENTS)) {
     DoubleRegister result = ToDoubleRegister(instr->result());
     __ Ldr(result.S(), mem_op);
     __ Fcvt(result, result.S());
-  } else if (elements_kind == FLOAT64_ELEMENTS) {
+  } else if ((elements_kind == EXTERNAL_FLOAT64_ELEMENTS) ||
+             (elements_kind == FLOAT64_ELEMENTS)) {
     DoubleRegister result = ToDoubleRegister(instr->result());
     __ Ldr(result, mem_op);
   } else {
     Register result = ToRegister(instr->result());
 
     switch (elements_kind) {
+      case EXTERNAL_INT8_ELEMENTS:
       case INT8_ELEMENTS:
         __ Ldrsb(result, mem_op);
         break;
+      case EXTERNAL_UINT8_CLAMPED_ELEMENTS:
+      case EXTERNAL_UINT8_ELEMENTS:
       case UINT8_ELEMENTS:
       case UINT8_CLAMPED_ELEMENTS:
         __ Ldrb(result, mem_op);
         break;
+      case EXTERNAL_INT16_ELEMENTS:
       case INT16_ELEMENTS:
         __ Ldrsh(result, mem_op);
         break;
+      case EXTERNAL_UINT16_ELEMENTS:
       case UINT16_ELEMENTS:
         __ Ldrh(result, mem_op);
         break;
+      case EXTERNAL_INT32_ELEMENTS:
       case INT32_ELEMENTS:
         __ Ldrsw(result, mem_op);
         break;
+      case EXTERNAL_UINT32_ELEMENTS:
       case UINT32_ELEMENTS:
         __ Ldr(result.W(), mem_op);
         if (!instr->hydrogen()->CheckFlag(HInstruction::kUint32)) {
@@ -3495,6 +3504,8 @@
         break;
       case FLOAT32_ELEMENTS:
       case FLOAT64_ELEMENTS:
+      case EXTERNAL_FLOAT32_ELEMENTS:
+      case EXTERNAL_FLOAT64_ELEMENTS:
       case FAST_HOLEY_DOUBLE_ELEMENTS:
       case FAST_HOLEY_ELEMENTS:
       case FAST_HOLEY_SMI_ELEMENTS:
@@ -5169,33 +5180,44 @@
                                      elements_kind,
                                      instr->base_offset());
 
-  if (elements_kind == FLOAT32_ELEMENTS) {
+  if ((elements_kind == EXTERNAL_FLOAT32_ELEMENTS) ||
+      (elements_kind == FLOAT32_ELEMENTS)) {
     DoubleRegister value = ToDoubleRegister(instr->value());
     DoubleRegister dbl_scratch = double_scratch();
     __ Fcvt(dbl_scratch.S(), value);
     __ Str(dbl_scratch.S(), dst);
-  } else if (elements_kind == FLOAT64_ELEMENTS) {
+  } else if ((elements_kind == EXTERNAL_FLOAT64_ELEMENTS) ||
+             (elements_kind == FLOAT64_ELEMENTS)) {
     DoubleRegister value = ToDoubleRegister(instr->value());
     __ Str(value, dst);
   } else {
     Register value = ToRegister(instr->value());
 
     switch (elements_kind) {
+      case EXTERNAL_UINT8_CLAMPED_ELEMENTS:
+      case EXTERNAL_INT8_ELEMENTS:
+      case EXTERNAL_UINT8_ELEMENTS:
       case UINT8_ELEMENTS:
       case UINT8_CLAMPED_ELEMENTS:
       case INT8_ELEMENTS:
         __ Strb(value, dst);
         break;
+      case EXTERNAL_INT16_ELEMENTS:
+      case EXTERNAL_UINT16_ELEMENTS:
       case INT16_ELEMENTS:
       case UINT16_ELEMENTS:
         __ Strh(value, dst);
         break;
+      case EXTERNAL_INT32_ELEMENTS:
+      case EXTERNAL_UINT32_ELEMENTS:
       case INT32_ELEMENTS:
       case UINT32_ELEMENTS:
         __ Str(value.W(), dst);
         break;
       case FLOAT32_ELEMENTS:
       case FLOAT64_ELEMENTS:
+      case EXTERNAL_FLOAT32_ELEMENTS:
+      case EXTERNAL_FLOAT64_ELEMENTS:
       case FAST_DOUBLE_ELEMENTS:
       case FAST_ELEMENTS:
       case FAST_SMI_ELEMENTS: