[TypeChecker] NFC: Allow perf test-case for rdar://74035425 to run only on macOS

Resolves: rdar://85267603

Author: xedin

validation-test/Sema/type_checker_perf/fast/rdar74035425.swift

@@ -1,5 +1,6 @@
 // RUN: %target-typecheck-verify-swift -solver-expression-time-threshold=1
 // REQUIRES: tools-release,no_asan
+// REQUIRES: OS=macosx
 
 struct Value {
   let debugDescription: String