[bugpoint] Add testcase for r203343.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203472 91177308-0d34-0410-b5e6-96231b3b80d8

test/BugPoint/compile-custom.ll.py

@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+
+import sys
+
+# Currently any print-out from the custom tool is interpreted as a crash
+# (i.e. test is still interesting)
+
+print "Error: " + ' '.join(sys.argv[1:])
+
+sys.exit(1)