NFC: Fix %target-run-simple-swift invocations in a couple of tests.

tshortli · tshortli · commit 2442737a7dd6 · 2023-07-31T17:26:34.000-07:00
The `-unavailable-decl-optimization` flag is a frontend flag and therefore
requires `-Xfrontend` when passed through the driver.
diff --git a/test/decl/protocol/special/coding/enum_coding_key_unavailable_element.swift b/test/decl/protocol/special/coding/enum_coding_key_unavailable_element.swift
@@ -1,5 +1,5 @@
 // RUN: %target-run-simple-swift
-// RUN: %target-run-simple-swift(-unavailable-decl-optimization=complete)
+// RUN: %target-run-simple-swift(-Xfrontend -unavailable-decl-optimization=complete)
 
 // REQUIRES: executable_test
 
diff --git a/test/stdlib/CodableEnumUnavailableElement.swift b/test/stdlib/CodableEnumUnavailableElement.swift
@@ -1,5 +1,5 @@
 // RUN: %target-run-simple-swift
-// RUN: %target-run-simple-swift(-unavailable-decl-optimization=complete)
+// RUN: %target-run-simple-swift(-Xfrontend -unavailable-decl-optimization=complete)
 // REQUIRES: executable_test
 // REQUIRES: objc_interop
 
