Introduce SpecificBumpPtrAllocator, a wrapper for BumpPtrAllocator which allows

only a single type of object to be allocated. Use it to make VNInfo destruction
typesafe.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99919 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LiveStackAnalysis.cpp

@@ -36,7 +36,7 @@ void LiveStacks::getAnalysisUsage(AnalysisUsage &AU) const {
 
 void LiveStacks::releaseMemory() {
   // Release VNInfo memroy regions after all VNInfo objects are dtor'd.
-  VNInfoAllocator.Reset();
+  VNInfoAllocator.DestroyAll();
   S2IMap.clear();
   S2RCMap.clear();
 }