[NFC] Make LoopSafetyInfo abstract to allow alternative implementations

llvm-svn: 344592
diff --git a/llvm/lib/Transforms/Utils/LoopUnrollAndJam.cpp b/llvm/lib/Transforms/Utils/LoopUnrollAndJam.cpp
index c17a64f..8949c60 100644
--- a/llvm/lib/Transforms/Utils/LoopUnrollAndJam.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUnrollAndJam.cpp
@@ -761,7 +761,7 @@
   }
 
   // Check the loop safety info for exceptions.
-  LoopSafetyInfo LSI;
+  SimpleLoopSafetyInfo LSI;
   LSI.computeLoopSafetyInfo(L);
   if (LSI.anyBlockMayThrow()) {
     LLVM_DEBUG(dbgs() << "Won't unroll-and-jam; Something may throw\n");