[Polly] Add -e to test generation script

[dpeixott]

Summary

The -e flag exits the script with a non-zero code if any subcommand
fails. This flag allows us to notice as early as possible if the
test was not properly regenerated using a command like:

$ create_ll.sh t.c && opt < t.ll -polly ...

The above pattern is useful when iteratively developing a test case
to guard against un-noticed syntax errors.

[jdoerfert]

Minor. Can you commit it?

[dpeixott]

Closed by commit rL217463 (authored by @dpeixott).

test/create_ll.sh

-#!/bin/sh
+#!/bin/sh -e
 
 LLFILE=`echo $1 | sed -e 's/\.c/.ll/g'`
 LLFILE_TMP=${LLFILE}.tmp
 
 # The number of lines to cut of the LLVM-IR file clang produces.
 CUT_N_LINES=6
 
 clang -c -S -emit-llvm -O0 $1 -o ${LLFILE}