Tests: Add REQUIRES: optimized_stdlib to skip-function-bodies-Onone.swift.

Author: tshortli

test/Frontend/skip-function-bodies-Onone.swift

@@ -2,4 +2,6 @@
 // RUN: %target-swift-frontend -typecheck -experimental-skip-non-inlinable-function-bodies-without-types -module-name SwiftOnoneSupport %s 2>&1 | %FileCheck %s
 // RUN: %target-swift-frontend -typecheck -experimental-skip-all-function-bodies -module-name SwiftOnoneSupport %s 2>&1 | %FileCheck %s
 
+// REQUIRES: optimized_stdlib
+
 // CHECK: module 'SwiftOnoneSupport' cannot be built with any of the -experimental-skip-*-function-bodies* flags; they have been automatically disabled