Remove the dependency of Zone on Isolate

src/compiler/ia32/instruction-selector-ia32.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/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 13 matching lines @@
   bool CanBeImmediate(Node* node) {
     switch (node->opcode()) {
       case IrOpcode::kInt32Constant:
       case IrOpcode::kNumberConstant:
       case IrOpcode::kExternalConstant:
         return true;
       case IrOpcode::kHeapConstant: {
         // Constants in new space cannot be used as immediates in V8 because
         // the GC does not scan code objects when collecting the new generation.
         Unique<HeapObject> value = OpParameter<Unique<HeapObject> >(node);
-        return !isolate()->heap()->InNewSpace(*value.handle());
+        Isolate* isolate = value.handle()->GetIsolate();
+        return !isolate->heap()->InNewSpace(*value.handle());
       }
       default:
         return false;
     }
   }
 
   AddressingMode GenerateMemoryOperandInputs(Node* index, int scale, Node* base,
                                              Node* displacement_node,
                                              InstructionOperand* inputs[],
                                              size_t* input_count) {
@@ skipping 962 matching lines @@
            MachineOperatorBuilder::kFloat64Ceil |
            MachineOperatorBuilder::kFloat64RoundTruncate |
            MachineOperatorBuilder::kWord32ShiftIsSafe;
   }
   return MachineOperatorBuilder::Flag::kNoFlags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8