Make get_label_info take into account the toolchain for target_gen_dir

tools/gn/ninja_binary_target_writer.cc

Index: tools/gn/ninja_binary_target_writer.cc
diff --git a/tools/gn/ninja_binary_target_writer.cc b/tools/gn/ninja_binary_target_writer.cc
index 129ddb1b849dfbe5cccb2bd4648356ce7b60f707..da46149efa6b162180238c97d7414b8fdb06f9b5 100644
--- a/tools/gn/ninja_binary_target_writer.cc
+++ b/tools/gn/ninja_binary_target_writer.cc
@@ -417,10 +417,8 @@ OutputFile NinjaBinaryTargetWriter::WriteInputsStampAndGetDep() const {
     return OutputFile(settings_->build_settings(), target_->inputs()[0]);
 
   // Make a stamp file.
-  OutputFile input_stamp_file(
-      RebasePath(GetTargetOutputDir(target_).value(),
-                 settings_->build_settings()->build_dir(),
-                 settings_->build_settings()->root_path_utf8()));
+  OutputFile input_stamp_file =
+      GetBuildDirForTargetAsOutputFile(target_, BuildDirType::OBJ);
   input_stamp_file.value().append(target_->label().name());
   input_stamp_file.value().append(".inputs.stamp");
 
@@ -1039,7 +1037,7 @@ OutputFile NinjaBinaryTargetWriter::GetWindowsPCHFile(
     Toolchain::ToolType tool_type) const {
   // Use "obj/{dir}/{target_name}_{lang}.pch" which ends up
   // looking like "obj/chrome/browser/browser_cc.pch"
-  OutputFile ret = GetTargetOutputDirAsOutputFile(target_);
+  OutputFile ret = GetBuildDirForTargetAsOutputFile(target_, BuildDirType::OBJ);
   ret.value().append(target_->label().name());
   ret.value().push_back('_');
   ret.value().append(GetPCHLangSuffixForToolType(tool_type));