[turbofan] Extend LoadElimination to introduce TypeGuards.

src/compiler/load-elimination.h

Index: src/compiler/load-elimination.h
diff --git a/src/compiler/load-elimination.h b/src/compiler/load-elimination.h
index f2cb6c16f64cc4371b1c7a785839402537a5f4bd..5aa62b48bd8d603d2e4e748a56078fcf3276d9b8 100644
--- a/src/compiler/load-elimination.h
+++ b/src/compiler/load-elimination.h
@@ -12,7 +12,9 @@ namespace internal {
 namespace compiler {
 
 // Foward declarations.
+class CommonOperatorBuilder;
 struct FieldAccess;
+class Graph;
 class JSGraph;
 
 class LoadElimination final : public AdvancedReducer {
@@ -206,7 +208,9 @@ class LoadElimination final : public AdvancedReducer {
 
   static int FieldIndexOf(FieldAccess const& access);
 
+  CommonOperatorBuilder* common() const;
   AbstractState const* empty_state() const { return &empty_state_; }
+  Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   Zone* zone() const { return node_states_.zone(); }