[ScopInfo] Tighten compute out introduced in r303404

It seems we are still spending too much time on rare inputs, which continue to
timeout the AOSP buildbot. Let's see if a further reduction is sufficient.

llvm-svn: 303807
diff --git a/polly/lib/Analysis/ScopInfo.cpp b/polly/lib/Analysis/ScopInfo.cpp
index addb338..89f088fc 100644
--- a/polly/lib/Analysis/ScopInfo.cpp
+++ b/polly/lib/Analysis/ScopInfo.cpp
@@ -98,7 +98,7 @@
     OptComputeOut("polly-analysis-computeout",
                   cl::desc("Bound the scop analysis by a maximal amount of "
                            "computational steps (0 means no bound)"),
-                  cl::Hidden, cl::init(1000000), cl::ZeroOrMore,
+                  cl::Hidden, cl::init(600000), cl::ZeroOrMore,
                   cl::cat(PollyCategory));
 
 static cl::opt<bool> PollyRemarksMinimal(