[lit] Fix order of checks in shtest-shell.py test

Summary:
An expectation in `utils/lit/tests/Inputs/shtest-shell/redirects.txt`
expects that first a string printed to stdout is seen, and then a
string printed to stderr. Add `flush()` calls to ensure that stdout is
printed before stderr, as expected.

Reviewers: rnk, mgorny, jroelofs

Reviewed By: rnk

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D35947

llvm-svn: 309292

utils/lit/tests/Inputs/shtest-shell/write-to-stderr.py

@@ -1,3 +1,7 @@
 #!/usr/bin/env python
+
 import sys
+
+
 sys.stderr.write("a line on stderr\n")
+sys.stderr.flush()

utils/lit/tests/Inputs/shtest-shell/write-to-stdout-and-stderr.py

@@ -1,4 +1,10 @@
 #!/usr/bin/env python
+
 import sys
+
+
 sys.stdout.write("a line on stdout\n")
+sys.stdout.flush()
+
 sys.stderr.write("a line on stderr\n")
+sys.stderr.flush()