Merge pull request #21989 from nkcsgexi/preset

build-script/presets: add a preset to only build parser library and SwiftSyntax

Author: nkcsgexi

utils/build-presets.ini

@@ -1772,3 +1772,9 @@ build-swift-examples=0
 swift-include-tests=0
 darwin-deployment-version-ios=10.0
 darwin-crash-reporter-client=1
+
+[preset: build_swiftsyntax_release]
+release
+no-assertions
+build-libparser-only
+swiftsyntax