[Test] Remove experimental flag in pre_specialize-macos test (#61494)

Author: drexin

test/SILOptimizer/pre_specialize-macos.swift

@@ -1,8 +1,8 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-swift-frontend -enable-experimental-feature LayoutPrespecialization -O -swift-version 5 -enable-library-evolution -emit-module -o /dev/null -emit-module-interface-path %t/pre_specialized_module.swiftinterface %S/Inputs/pre_specialized_module.swift -module-name pre_specialized_module
-// RUN: %target-swift-frontend -enable-experimental-feature LayoutPrespecialization -I %t -O -swift-version 5 -enable-library-evolution -emit-module -o /dev/null -emit-module-interface-path %t/pre_specialized_module2.swiftinterface %S/Inputs/pre_specialized_module2.swift -module-name pre_specialized_module2
-// RUN: %target-swift-frontend -enable-experimental-feature LayoutPrespecialization -I %t -O -emit-sil -target %target-cpu-apple-macos11 %s | %FileCheck %s --check-prefix=OPT --check-prefix=CHECK
-// RUN: %target-swift-frontend -enable-experimental-feature LayoutPrespecialization -I %t -O -emit-sil -target %target-cpu-apple-macosx10.9 %s | %FileCheck %s --check-prefix=NOOPT --check-prefix=CHECK
+// RUN: %target-swift-frontend -O -swift-version 5 -enable-library-evolution -emit-module -o /dev/null -emit-module-interface-path %t/pre_specialized_module.swiftinterface %S/Inputs/pre_specialized_module.swift -module-name pre_specialized_module
+// RUN: %target-swift-frontend -I %t -O -swift-version 5 -enable-library-evolution -emit-module -o /dev/null -emit-module-interface-path %t/pre_specialized_module2.swiftinterface %S/Inputs/pre_specialized_module2.swift -module-name pre_specialized_module2
+// RUN: %target-swift-frontend -I %t -O -emit-sil -target %target-cpu-apple-macos11 %s | %FileCheck %s --check-prefix=OPT --check-prefix=CHECK
+// RUN: %target-swift-frontend -I %t -O -emit-sil -target %target-cpu-apple-macosx10.9 %s | %FileCheck %s --check-prefix=NOOPT --check-prefix=CHECK
 
 // REQUIRES: OS=macosx && CPU=x86_64