Make diagnostic printing more deterministic when running tests.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70809 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/TestRunner.sh b/test/TestRunner.sh
index bb20728..5555364 100755
--- a/test/TestRunner.sh
+++ b/test/TestRunner.sh
@@ -18,6 +18,9 @@
 SUBST=$1
 FILEDIR=`dirname $TESTNAME`
 
+# Make diagnostic printing more determinstic.
+export COLUMNS=999
+
 OUTPUT=Output/$1.out
 
 # create the output directory if it does not already exist