Minor cleanup using BooleanConstant in graph builder.

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index 7cff07ce3eaf05cb8bbc82144a37cd060c0f59a2..e333b066842b446865c41ff7d4f4d03d45ded35f 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -136,6 +136,7 @@ class AstGraphBuilder : public StructuredGraphBuilder, public AstVisitor {
   SetOncePointer<Node> function_closure_;
   SetOncePointer<Node> function_context_;
 
+  // Result of loop assignment analysis performed before graph creation.
   LoopAssignmentAnalysis* loop_assignment_analysis_;
 
   CompilationInfo* info() const { return info_; }
@@ -189,8 +190,6 @@ class AstGraphBuilder : public StructuredGraphBuilder, public AstVisitor {
       Node* node, BailoutId ast_id,
       OutputFrameStateCombine combine = OutputFrameStateCombine::Ignore());
 
-  OutputFrameStateCombine StateCombineFromAstContext();
-
   BitVector* GetVariablesAssignedInLoop(IterationStatement* stmt);
 
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
@@ -439,8 +438,9 @@ class AstGraphBuilder::ContextScope BASE_EMBEDDED {
 Scope* AstGraphBuilder::current_scope() const {
   return execution_context_->scope();
 }
-}
-}
-}  // namespace v8::internal::compiler
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_COMPILER_AST_GRAPH_BUILDER_H_