Don't redundantly specify the default template argument to BumpPtrAllocatorImpl (#114857)

Author: zygoloid

clang/lib/AST/ByteCode/DynamicAllocator.h

@@ -97,7 +97,7 @@ class DynamicAllocator final {
 private:
   llvm::DenseMap<const Expr *, AllocationSite> AllocationSites;
 
-  using PoolAllocTy = llvm::BumpPtrAllocatorImpl<llvm::MallocAllocator>;
+  using PoolAllocTy = llvm::BumpPtrAllocator;
   PoolAllocTy DescAllocator;
 
   /// Allocates a new descriptor.

clang/lib/AST/ByteCode/Program.h

@@ -171,7 +171,7 @@ class Program final {
   llvm::DenseMap<const void *, unsigned> NativePointerIndices;
 
   /// Custom allocator for global storage.
-  using PoolAllocTy = llvm::BumpPtrAllocatorImpl<llvm::MallocAllocator>;
+  using PoolAllocTy = llvm::BumpPtrAllocator;
 
   /// Descriptor + storage for a global object.
   ///