GN: Makes GN output deterministic

tools/gn/command_desc.cc

Index: tools/gn/command_desc.cc
diff --git a/tools/gn/command_desc.cc b/tools/gn/command_desc.cc
index 3f2bbaf51fb15b23ad9d3545eb46d1a4164de7ee..e78be769ce2f504223378a8809b2d60154822ee8 100644
--- a/tools/gn/command_desc.cc
+++ b/tools/gn/command_desc.cc
@@ -14,6 +14,7 @@
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/item.h"
 #include "tools/gn/label.h"
+#include "tools/gn/pointer_set.h"
 #include "tools/gn/runtime_deps.h"
 #include "tools/gn/setup.h"
 #include "tools/gn/standard_out.h"
@@ -46,10 +47,10 @@ std::string FormatSourceDir(const SourceDir& dir) {
 }
 
 void RecursiveCollectChildDeps(const Target* target,
-                               std::set<const Target*>* result);
+                               PointerSet<const Target>* result);
 
 void RecursiveCollectDeps(const Target* target,
-                          std::set<const Target*>* result) {
+                          PointerSet<const Target>* result) {
   if (result->find(target) != result->end())
     return;  // Already did this target.
   result->insert(target);
@@ -58,7 +59,7 @@ void RecursiveCollectDeps(const Target* target,
 }
 
 void RecursiveCollectChildDeps(const Target* target,
-                               std::set<const Target*>* result) {
+                               PointerSet<const Target>* result) {
   for (const auto& pair : target->GetDeps(Target::DEPS_ALL))
     RecursiveCollectDeps(pair.ptr, result);
 }
@@ -69,7 +70,7 @@ void RecursiveCollectChildDeps(const Target* target,
 // set is null, all dependencies will be printed.
 void RecursivePrintDeps(const Target* target,
                         const Label& default_toolchain,
-                        std::set<const Target*>* seen_targets,
+                        PointerSet<const Target>* seen_targets,
                         int indent_level) {
   // Combine all deps into one sorted list.
   std::vector<LabelTargetPair> sorted_deps;
@@ -123,7 +124,7 @@ void PrintDeps(const Target* target, bool display_header) {
       RecursivePrintDeps(target, toolchain_label, nullptr, 1);
     } else {
       // Don't recurse into duplicates.
-      std::set<const Target*> seen_targets;
+      PointerSet<const Target> seen_targets;
       RecursivePrintDeps(target, toolchain_label, &seen_targets, 1);
     }
     return;
@@ -135,7 +136,7 @@ void PrintDeps(const Target* target, bool display_header) {
     if (display_header)
       OutputString("\nAll recursive dependencies:\n");
 
-    std::set<const Target*> all_deps;
+    PointerSet<const Target> all_deps;
     RecursiveCollectChildDeps(target, &all_deps);
     FilterAndPrintTargetSet(display_header, all_deps);
   } else {