Add a testcase to verify that commands don't crash when they hit

errors on stderr.

llvm-svn: 111440

llvm/test/Other/close-stderr.ll

@@ -0,0 +1,9 @@
+; RUN: sh -c "\
+; RUN:        opt --reject-this-option 2>&-; echo $?; \
+; RUN:        opt -o /dev/null /dev/null 2>&-; echo $?; \
+; RUN:       " | FileCheck %s
+; CHECK: {{^1$}}
+; CHECK: {{^0$}}
+
+; Test that the error handling when writing to stderr fails exits the
+; program cleanly rather than aborting.