Update the recommended isl version

Recent changes in isl:

- Allow analysis of loops during code generation

This simplifies the detection of parallel loops.

- Simplify the way costumized ast printers are defined

This enables us to highlight parallel / vector loops in our debug output.

- Compile time improvements for codegen contexts that include parameters

- Various bug fixes

This update also gets us in sync for the isl 0.11 release.

llvm-svn: 169100

polly/lib/CodeGen/IslAst.cpp

@@ -150,7 +150,6 @@ void IslAst::pprint(llvm::raw_ostream &OS) {
   OS << result << "\n";
   isl_printer_free(P);
   isl_ast_node_free(Root);
-  isl_ast_print_options_free(Options);
 }
 
 /// Create the isl_ast from this program.

polly/utils/checkout_cloog.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 CLOOG_HASH="57470e76bfd58a0c38c598e816411663193e0f45"
-ISL_HASH="cc969a737d4f8de258a462c3cb1c063fe2f1c5cf"
+ISL_HASH="acc5df2f96fc0c04495cd237f0b5b5eb8822ed85"
 
 PWD=`pwd`