[turbofan][arm64] Use immediates instead of MiscField for stack operations.

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/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 592 matching lines @@
              i.InputInt6(3));
       break;
     case kArm64TestAndBranch32:
     case kArm64TestAndBranch:
       // Pseudo instructions turned into tbz/tbnz in AssembleArchBranch.
       break;
     case kArm64CompareAndBranch32:
       // Pseudo instruction turned into cbz/cbnz in AssembleArchBranch.
       break;
     case kArm64Claim: {
-      int words = MiscField::decode(instr->opcode());
-      __ Claim(words);
+      __ Claim(i.InputInt32(0));
       break;
     }
     case kArm64Poke: {
-      int slot = MiscField::decode(instr->opcode());
-      Operand operand(slot * kPointerSize);
+      Operand operand(i.InputInt32(1) * kPointerSize);
       __ Poke(i.InputRegister(0), operand);
       break;
     }
-    case kArm64PokePairZero: {
-      // TODO(dcarney): test slot offset and register order.
-      int slot = MiscField::decode(instr->opcode()) - 1;
-      __ PokePair(i.InputRegister(0), xzr, slot * kPointerSize);
-      break;
-    }
     case kArm64PokePair: {
-      int slot = MiscField::decode(instr->opcode()) - 1;
+      int slot = i.InputInt32(2) - 1;
       __ PokePair(i.InputRegister(1), i.InputRegister(0), slot * kPointerSize);
       break;
     }
     case kArm64Clz32:
       __ Clz(i.OutputRegister32(), i.InputRegister32(0));
       break;
     case kArm64Cmp:
       __ Cmp(i.InputRegister(0), i.InputOperand(1));
       break;
     case kArm64Cmp32:
@@ skipping 578 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8