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

src/compiler/mips64/code-generator-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/compiler/code-generator.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
 #include "src/mips/macro-assembler-mips.h"
@@ skipping 888 matching lines @@
       break;
     case kCheckedLoadInt16:
       ASSEMBLE_CHECKED_LOAD_INTEGER(lh);
       break;
     case kCheckedLoadUint16:
       ASSEMBLE_CHECKED_LOAD_INTEGER(lhu);
       break;
     case kCheckedLoadWord32:
       ASSEMBLE_CHECKED_LOAD_INTEGER(lw);
       break;
+    case kCheckedLoadWord64:
+      ASSEMBLE_CHECKED_LOAD_INTEGER(ld);
+      break;
     case kCheckedLoadFloat32:
       ASSEMBLE_CHECKED_LOAD_FLOAT(Single, lwc1);
       break;
     case kCheckedLoadFloat64:
       ASSEMBLE_CHECKED_LOAD_FLOAT(Double, ldc1);
       break;
     case kCheckedStoreWord8:
       ASSEMBLE_CHECKED_STORE_INTEGER(sb);
       break;
     case kCheckedStoreWord16:
       ASSEMBLE_CHECKED_STORE_INTEGER(sh);
       break;
     case kCheckedStoreWord32:
       ASSEMBLE_CHECKED_STORE_INTEGER(sw);
       break;
+    case kCheckedStoreWord64:
+      ASSEMBLE_CHECKED_STORE_INTEGER(sd);
+      break;
     case kCheckedStoreFloat32:
       ASSEMBLE_CHECKED_STORE_FLOAT(Single, swc1);
       break;
     case kCheckedStoreFloat64:
       ASSEMBLE_CHECKED_STORE_FLOAT(Double, sdc1);
       break;
   }
 }  // NOLINT(readability/fn_size)
 
 
@@ skipping 513 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8