test: repair Android builds

This test requires execution, which the android CI currently does not support.
Mark the test as executable to fix the CI.

Author: compnerd

test/Frontend/crash-in-user-code.swift

@@ -2,6 +2,8 @@
 // RUN: echo %s > %t.filelist.txt
 // RUN: not --crash %target-swift-frontend -interpret -filelist %t.filelist.txt 2>&1 | %FileCheck %s
 
+// REQUIRES: executable_test
+
 // UNSUPPORTED: OS=ios
 // UNSUPPORTED: OS=tvos
 // UNSUPPORTED: OS=watchos