[stubs,interpreter] Optimise SMI loading for 64-bit targets.

src/compiler/arm64/code-generator-arm64.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/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 1513 matching lines @@
       break;
     case kArm64Ldrh:
       __ Ldrh(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Ldrsh:
       __ Ldrsh(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Strh:
       __ Strh(i.InputOrZeroRegister64(0), i.MemoryOperand(1));
       break;
+    case kArm64Ldrsw:
+      __ Ldrsw(i.OutputRegister(), i.MemoryOperand());
+      break;
     case kArm64LdrW:
       __ Ldr(i.OutputRegister32(), i.MemoryOperand());
       break;
     case kArm64StrW:
       __ Str(i.InputOrZeroRegister32(0), i.MemoryOperand(1));
       break;
     case kArm64Ldr:
       __ Ldr(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Str:
@@ skipping 528 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8