The built-in shell test runner for some reason doesn't like the quoting

and multi-line nature of this test. I don't really feel like bugging
this kind of edge-case, so just put it on one line and use single
quotes. With this, every test *really* passes with the built-in shell
test runner.

llvm-svn: 159530

llvm/test/Other/close-stderr.ll

@@ -1,7 +1,5 @@
-; RUN: sh -c "\
-; RUN:        opt --reject-this-option 2>&-; echo \$?; \
-; RUN:        opt -o /dev/null /dev/null 2>&-; echo \$?; \
-; RUN:       " | FileCheck %s
+; RUN: sh -c 'opt --reject-this-option 2>&-; echo $?; opt -o /dev/null /dev/null 2>&-; echo $?;' \
+; RUN:   | FileCheck %s
 ; CHECK: {{^1$}}
 ; CHECK: {{^0$}}
 ; XFAIL: vg_leak