Merge pull request swiftlang#22065 from nkcsgexi/build-dir-pre

build-script: allow users to specify build-dir under the preset mode.

Author: nkcsgexi

utils/build-presets.ini

@@ -1779,3 +1779,4 @@ lto
 no-assertions
 build-libparser-only
 swiftsyntax
+verbose-build

utils/build-script

@@ -996,6 +996,9 @@ def main_preset():
     parser.add_argument(
         "--swiftsyntax-install-prefix",
         help="specify the directory to where SwiftSyntax should be installed")
+    parser.add_argument(
+        "--build-dir",
+        help="specify the directory where build artifact should be stored")
     args = parser.parse_args()
     if len(args.preset_file_names) == 0:
         args.preset_file_names = [
@@ -1050,6 +1053,8 @@ def main_preset():
         build_script_args += ["--install-swiftsyntax",
                               "--install-destdir",
                               args.swiftsyntax_install_prefix]
+    if args.build_dir:
+        build_script_args += ["--build-dir", args.build_dir]
 
     diagnostics.note('using preset "{}", which expands to \n\n{}\n'.format(
         args.preset, shell.quote_command(build_script_args)))