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
diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index 1a2cc25..8ddcac7 100644
--- a/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -55,7 +55,7 @@
 
     /// Special pool allocator for VNInfo's (LiveInterval val#).
     ///
-    BumpPtrAllocator VNInfoAllocator;
+    VNInfo::Allocator VNInfoAllocator;
 
     typedef DenseMap<unsigned, LiveInterval*> Reg2IntervalMap;
     Reg2IntervalMap r2iMap_;
@@ -221,7 +221,7 @@
       indexes_->renumberIndexes();
     }
 
-    BumpPtrAllocator& getVNInfoAllocator() { return VNInfoAllocator; }
+    VNInfo::Allocator& getVNInfoAllocator() { return VNInfoAllocator; }
 
     /// getVNInfoSourceReg - Helper function that parses the specified VNInfo
     /// copy field and returns the source register that defines it.