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

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 82b0b4772f6b4585ef4d2979d47334986c7b1ba2..80daf9ff47accc09fcdcd674a8ce9fd850cdadf6 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -121,8 +121,8 @@ void Interpreter::DoLdaConstant(compiler::InterpreterAssembler* assembler) {
 //
 // Load Undefined into the accumulator.
 void Interpreter::DoLdaUndefined(compiler::InterpreterAssembler* assembler) {
-  Node* undefined_value = __ HeapConstant(Unique<HeapObject>::CreateImmovable(
-      isolate_->factory()->undefined_value()));
+  Node* undefined_value =
+      __ HeapConstant(isolate_->factory()->undefined_value());
   __ SetAccumulator(undefined_value);
   __ Dispatch();
 }
@@ -132,8 +132,7 @@ void Interpreter::DoLdaUndefined(compiler::InterpreterAssembler* assembler) {
 //
 // Load Null into the accumulator.
 void Interpreter::DoLdaNull(compiler::InterpreterAssembler* assembler) {
-  Node* null_value = __ HeapConstant(
-      Unique<HeapObject>::CreateImmovable(isolate_->factory()->null_value()));
+  Node* null_value = __ HeapConstant(isolate_->factory()->null_value());
   __ SetAccumulator(null_value);
   __ Dispatch();
 }
@@ -143,8 +142,7 @@ void Interpreter::DoLdaNull(compiler::InterpreterAssembler* assembler) {
 //
 // Load TheHole into the accumulator.
 void Interpreter::DoLdaTheHole(compiler::InterpreterAssembler* assembler) {
-  Node* the_hole_value = __ HeapConstant(Unique<HeapObject>::CreateImmovable(
-      isolate_->factory()->the_hole_value()));
+  Node* the_hole_value = __ HeapConstant(isolate_->factory()->the_hole_value());
   __ SetAccumulator(the_hole_value);
   __ Dispatch();
 }
@@ -154,8 +152,7 @@ void Interpreter::DoLdaTheHole(compiler::InterpreterAssembler* assembler) {
 //
 // Load True into the accumulator.
 void Interpreter::DoLdaTrue(compiler::InterpreterAssembler* assembler) {
-  Node* true_value = __ HeapConstant(
-      Unique<HeapObject>::CreateImmovable(isolate_->factory()->true_value()));
+  Node* true_value = __ HeapConstant(isolate_->factory()->true_value());
   __ SetAccumulator(true_value);
   __ Dispatch();
 }
@@ -165,8 +162,7 @@ void Interpreter::DoLdaTrue(compiler::InterpreterAssembler* assembler) {
 //
 // Load False into the accumulator.
 void Interpreter::DoLdaFalse(compiler::InterpreterAssembler* assembler) {
-  Node* false_value = __ HeapConstant(
-      Unique<HeapObject>::CreateImmovable(isolate_->factory()->false_value()));
+  Node* false_value = __ HeapConstant(isolate_->factory()->false_value());
   __ SetAccumulator(false_value);
   __ Dispatch();
 }