test: run a subset of the test suite with -enable-sil-opaque-values

This will only kick-in during a full test (validation test)

Author: kavon

utils/build-presets.ini

@@ -1854,6 +1854,10 @@ skip-test-tvos-host
 # Run the SIL verifier after each transform when building swift files
 sil-verify-all-macos-only
 
+# Run a subset of the test suite with -enable-sil-opaque-values
+# until it's enabled by default (rdar://24065053)
+test-optimize-none-with-opaque-values
+
 # Don't run host tests for iOS, tvOS and watchOS platforms to make the build
 # faster.
 skip-test-ios-host