[turbofan] Remove usage of Unique<T> from graph.

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 1ea8dd6201ecee7919693dd24bcfe9a48651e396..9faf5ebcd87e97d075f61b369157c011eb08beaf 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -36,9 +36,9 @@ class IA32OperandGenerator final : public OperandGenerator {
       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);
-        Isolate* isolate = value.handle()->GetIsolate();
-        return !isolate->heap()->InNewSpace(*value.handle());
+        Handle<HeapObject> value = OpParameter<Handle<HeapObject>>(node);
+        Isolate* isolate = value->GetIsolate();
+        return !isolate->heap()->InNewSpace(*value);
       }
       default:
         return false;