GN: Makes GN output deterministic

tools/gn/target.h

Index: tools/gn/target.h
diff --git a/tools/gn/target.h b/tools/gn/target.h
index 10d3b05dd992ed1be07bb2a0a02248f4205b9793..86b3ffd0686b455f09e6262cb40d44d8b312f267 100644
--- a/tools/gn/target.h
+++ b/tools/gn/target.h
@@ -19,6 +19,7 @@
 #include "tools/gn/label_ptr.h"
 #include "tools/gn/ordered_set.h"
 #include "tools/gn/output_file.h"
+#include "tools/gn/pointer_set.h"
 #include "tools/gn/source_file.h"
 #include "tools/gn/unique_vector.h"
 
@@ -199,7 +200,7 @@ class Target : public Item {
   const OrderedSet<SourceDir>& all_lib_dirs() const { return all_lib_dirs_; }
   const OrderedSet<std::string>& all_libs() const { return all_libs_; }
 
-  const std::set<const Target*>& recursive_hard_deps() const {
+  const PointerSet<const Target>& recursive_hard_deps() const {
     return recursive_hard_deps_;
   }
 
@@ -244,6 +245,8 @@ class Target : public Item {
     return dependency_output_file_;
   }
 
+  bool operator<(const Target& other) const;
+
  private:
   FRIEND_TEST_ALL_PREFIXES(Target, ResolvePrecompiledHeaders);
 
@@ -306,7 +309,7 @@ class Target : public Item {
 
   // All hard deps from this target and all dependencies. Filled in when this
   // target is marked resolved. This will not include the current target.
-  std::set<const Target*> recursive_hard_deps_;
+  PointerSet<const Target> recursive_hard_deps_;
 
   // Used for all binary targets. The precompiled header values in this struct
   // will be resolved to the ones to use for this target, if precompiled