Fix scudo test

Scudo crashes when it trips. Pass the `--crash` flag to `not` to handle
it properly.

Author: etcwilde

test/Sanitizers/scudo.swift

@@ -1,5 +1,5 @@
 // RUN: %target-swiftc_driver %s -g -sanitize=scudo -o %t_scudo-binary
-// RUN: not %target-run %t_scudo-binary 2>&1 | %FileCheck %s
+// RUN: not --crash %target-run %t_scudo-binary 2>&1 | %FileCheck %s
 // REQUIRES: executable_test
 // REQUIRES: OS=linux-gnu
 // REQUIRES: scudo_runtime