Catch standard error output from the diff program into the diff file as

well as the standard output. This will help to record the difference info
in the Output/*.diff files as well as locate the difference info in the
correct place in the build output.


git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@31043 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Reid Spencer

DiffOutput.sh

@@ -32,7 +32,7 @@ TESTOUTPUT=Output/${PROG}.out-${WHICHOUTPUT}
 GOODOUTPUT=Output/${PROG}.out-${GOODOUTPUT}
 
 # Diff the two files.
-$DIFF $GOODOUTPUT $TESTOUTPUT > $DIFFOUTPUT || (
+$DIFF $GOODOUTPUT $TESTOUTPUT > $DIFFOUTPUT 2>&1 || (
   # They are different!
   echo "******************** TEST ($WHICHOUTPUT) '$PROG' FAILED! ********************"
   echo "Execution Context Diff:"