llvm dev - Jul 2016 - Heads-up: Change output change in MIR testing

Hi all,

As of r275314, the MIR testing infrastructure won’t print the regular output on
stderr but in the file specified by -o like every llc invocation.
I’ve updated all the in-tree test cases, but for out-of-tree targets/test case,
here is what to do to update your test cases:
- Get rid of 2>&1, unless you actually check errors.
- Replace -o /dev/null by -o -.

For your convenience, here is the script I used to update the llvm repository
and that left my only a couple of tests to fix:
for file in `grep -r 'RUN: .*llc .*\(\(start\|stop\)-after\|run-pass\)'
test/ -l`; do grep /dev/null  $file > /dev/null ; if [ $? -eq 0 ] ; then echo
$file ; cat $file | sed -e 's#\(RUN: .*\) -o /dev/null \(.*\)#\1 -o -
\2#g' | sed 's#\(RUN: .*\) 2>&1 \(.*\)#\1 \2#g' > tmp.txt
; mv tmp.txt $file ; grep 'RUN: not'  $file > /dev/null ; if [ $? -eq
0 ] ; then cat $file | sed -e 's#\(RUN: not .*\) -o - \(.*\)#\1 -o /dev/null
\2#g' | sed -e 's#\(RUN: not .*\) | FileCheck \(.*\)#\1 2>\&1 |
FileCheck \2#g' > tmp.txt ; mv tmp.txt $file ; fi ; fi ; done

Replace test/ at the beginning with test/CodeGen/YourTarget and you may also
want to use a different temporary file (here tmp.txt).

Cheers,
-Quentin 
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