[turbofan] support for Int64 in CheckedLoad/CheckedStore on 64-bit platforms.

src/compiler/mips64/instruction-selector-mips64.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/base/bits.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
@@ skipping 823 matching lines @@
   switch (rep) {
     case kRepWord8:
       opcode = typ == kTypeInt32 ? kCheckedLoadInt8 : kCheckedLoadUint8;
       break;
     case kRepWord16:
       opcode = typ == kTypeInt32 ? kCheckedLoadInt16 : kCheckedLoadUint16;
       break;
     case kRepWord32:
       opcode = kCheckedLoadWord32;
       break;
+    case kRepWord64:
+      opcode = kCheckedLoadWord64;
+      break;
     case kRepFloat32:
       opcode = kCheckedLoadFloat32;
       break;
     case kRepFloat64:
       opcode = kCheckedLoadFloat64;
       break;
     default:
       UNREACHABLE();
       return;
   }
@@ skipping 24 matching lines @@
   switch (rep) {
     case kRepWord8:
       opcode = kCheckedStoreWord8;
       break;
     case kRepWord16:
       opcode = kCheckedStoreWord16;
       break;
     case kRepWord32:
       opcode = kCheckedStoreWord32;
       break;
+    case kRepWord64:
+      opcode = kCheckedStoreWord64;
+      break;
     case kRepFloat32:
       opcode = kCheckedStoreFloat32;
       break;
     case kRepFloat64:
       opcode = kCheckedStoreFloat64;
       break;
     default:
       UNREACHABLE();
       return;
   }
@@ skipping 413 matching lines @@
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::kFloat64RoundDown |
          MachineOperatorBuilder::kFloat64RoundTruncate;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8