[polly] #include <algorithm>

For the usage of std::max in the header.

Speculative fix for
https://ci.chromium.org/ui/p/fuchsia/builders/toolchain.ci/clang-windows-x64/b8810806780048763729/overview
reported in https://reviews.llvm.org/D125263.

GitOrigin-RevId: c80b88ee29f34078d2149de94e27600093e6c7c0
diff --git a/include/polly/Support/ISLTools.h b/include/polly/Support/ISLTools.h
index 0aa7664..f7bc294 100644
--- a/include/polly/Support/ISLTools.h
+++ b/include/polly/Support/ISLTools.h
@@ -17,6 +17,7 @@
 #include "llvm/ADT/Sequence.h"
 #include "llvm/ADT/iterator.h"
 #include "isl/isl-noexceptions.h"
+#include <algorithm>
 #include <cassert>
 
 /// In debug builds assert that the @p Size is valid, in non-debug builds