[PATCH] [compiler-rt] Add a symbolizer testcase for closed stdin/stdout

[Alexey Samsonov]

LGTM


================
Comment at: test/asan/TestCases/closed-fds.cc:18
@@ +17,3 @@
+  assert(result > 0);
+  // CHECK-OUTPUT: Closing streams.
+  close(STDIN_FILENO);
----------------
CHECK-OUTPUT doesn't seem to be needed here at all.

http://reviews.llvm.org/D7973

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