Make get_label_info take into account the toolchain for target_gen_dir

tools/gn/function_get_label_info.cc

Index: tools/gn/function_get_label_info.cc
diff --git a/tools/gn/function_get_label_info.cc b/tools/gn/function_get_label_info.cc
index be22cca2ffb182e314561b384ddc833451c7eed7..58cb96411a4267c6f181c45c42706d529168bffa 100644
--- a/tools/gn/function_get_label_info.cc
+++ b/tools/gn/function_get_label_info.cc
@@ -11,14 +11,6 @@
 
 namespace functions {
 
-namespace {
-
-bool ToolchainIsDefault(const Scope* scope, const Label& toolchain_label) {
-  return scope->settings()->default_toolchain_label() == toolchain_label;
-}
-
-}  // namespace
-
 const char kGetLabelInfo[] = "get_label_info";
 const char kGetLabelInfo_HelpShort[] =
     "get_label_info: Get an attribute from a target's label.";
@@ -117,29 +109,25 @@ Value RunGetLabelInfo(Scope* scope,
     result.string_value() = DirectoryWithNoLastSlash(label.dir());
 
   } else if (what == "target_gen_dir") {
-    result.string_value() = DirectoryWithNoLastSlash(
-        GetGenDirForSourceDir(scope->settings(), label.dir()));
+    result.string_value() = DirectoryWithNoLastSlash(GetSubBuildDirAsSourceDir(
+        BuildDirContext(scope, label.GetToolchainLabel()),
+        label.dir(),
+        BuildDirType::GEN));
 
   } else if (what == "root_gen_dir") {
-    Label toolchain_label = label.GetToolchainLabel();
-    result.string_value() = DirectoryWithNoLastSlash(
-        GetToolchainGenDir(scope->settings()->build_settings(),
-                           toolchain_label,
-                           ToolchainIsDefault(scope, toolchain_label)));
+    result.string_value() = DirectoryWithNoLastSlash(GetBuildDirAsSourceDir(
+        BuildDirContext(scope, label.GetToolchainLabel()), BuildDirType::GEN));
 
   } else if (what == "target_out_dir") {
-    Label toolchain_label = label.GetToolchainLabel();
-    result.string_value() = DirectoryWithNoLastSlash(
-        GetOutputDirForSourceDir(scope->settings()->build_settings(),
-                                 label.dir(), toolchain_label,
-                                 ToolchainIsDefault(scope, toolchain_label)));
+    result.string_value() = DirectoryWithNoLastSlash(GetSubBuildDirAsSourceDir(
+        BuildDirContext(scope, label.GetToolchainLabel()),
+        label.dir(),
+        BuildDirType::OBJ));
 
   } else if (what == "root_out_dir") {
-    Label toolchain_label = label.GetToolchainLabel();
-    result.string_value() = DirectoryWithNoLastSlash(
-        GetToolchainOutputDir(scope->settings()->build_settings(),
-                              toolchain_label,
-                              ToolchainIsDefault(scope, toolchain_label)));
+    result.string_value() = DirectoryWithNoLastSlash(GetBuildDirAsSourceDir(
+        BuildDirContext(scope, label.GetToolchainLabel()),
+        BuildDirType::TOOLCHAIN_ROOT));
 
   } else if (what == "toolchain") {
     result.string_value() = label.GetToolchainLabel().GetUserVisibleName(false);