Allow non-affine control flow by default

With the patches r230325, r230329 and r230340 we can handle non-affine
  control flow in (loop-free) subregions. As all LLVM test-suite tests pass and
  we get ~20% more non-trivial SCoPs, we activate it now by default.

llvm-svn: 230624

polly/lib/Analysis/ScopDetection.cpp

@@ -129,7 +129,7 @@ static cl::opt<bool>
 static cl::opt<bool> AllowNonAffineSubRegions(
     "polly-allow-nonaffine-branches",
     cl::desc("Allow non affine conditions for branches"), cl::Hidden,
-    cl::init(false), cl::ZeroOrMore, cl::cat(PollyCategory));
+    cl::init(true), cl::ZeroOrMore, cl::cat(PollyCategory));
 
 static cl::opt<bool> AllowUnsigned("polly-allow-unsigned",
                                    cl::desc("Allow unsigned expressions"),