Switch to the most recent version of ISL.

This switch is not for any new features, but to test have Polly tested with
the upcoming isl 0.8.

llvm-svn: 141359

Author: tobiasgrosser

polly/utils/checkout_cloog.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 CLOOG_HASH="0c252c88946b27b7b61a1a8d8fd7f94d2461dbfd"
-ISL_HASH="56b7d238929980e62218525b4b3be121af386edf"
+ISL_HASH="e4da68b7e2c4e44ba2c9592c365779e7cea08b56"
 
 PWD=`pwd`