[ScopInfo] Fix isl object leak.

Fix return from function without releasing isl objects, which was introduced
in r269055.

llvm-svn: 285924

polly/lib/Analysis/ScopInfo.cpp

@@ -2798,8 +2798,11 @@ bool Scop::addLoopBoundsToHeaderDomain(Loop *L, LoopInfo &LI) {
       SmallVector<isl_set *, 8> ConditionSets;
       int idx = BI->getSuccessor(0) != HeaderBB;
       if (!buildConditionSets(*getStmtFor(LatchBB), TI, L, LatchBBDom,
-                              ConditionSets))
+                              ConditionSets)) {
+        isl_map_free(NextIterationMap);
+        isl_set_free(UnionBackedgeCondition);
         return false;
+      }
 
       // Free the non back edge condition set as we do not need it.
       isl_set_free(ConditionSets[1 - idx]);