Make get_label_info take into account the toolchain for target_gen_dir

tools/gn/target.cc

Index: tools/gn/target.cc
diff --git a/tools/gn/target.cc b/tools/gn/target.cc
index 206db8398609bfc959f41f9700605fdc9da4b369..aafdc4fedce82579452e522357e17519127e483e 100644
--- a/tools/gn/target.cc
+++ b/tools/gn/target.cc
@@ -543,7 +543,8 @@ void Target::FillOutputFiles() {
       // These don't get linked to and use stamps which should be the first
       // entry in the outputs. These stamps are named
       // "<target_out_dir>/<targetname>.stamp".
-      dependency_output_file_ = GetTargetOutputDirAsOutputFile(this);
+      dependency_output_file_ =
+          GetBuildDirForTargetAsOutputFile(this, BuildDirType::OBJ);
       dependency_output_file_.value().append(GetComputedOutputName());
       dependency_output_file_.value().append(".stamp");
       break;