This patch fixes these errors while building BOLT.

Compiling llvm/llvm-project/bolt/include/bolt/Passes/RegReAssign.h failed:
...: error: invalid application of 'sizeof' to an incomplete type 'llvm::bolt::BinaryFunctionCallGraph'

static_assert(sizeof(_Tp) >= 0, "cannot delete an incomplete type");
error: type 'llvm::bolt::BinaryBasicBlock *' cannot be used prior to '::' because it has no members

using NodeRef = typename GraphType::UnknownGraphTypeError;
BinaryDomTree.h:31:14: error: no template named 'DomTreeGraphTraitsBase'

: public DomTreeGraphTraitsBase<bolt::BinaryDomTreeNode,

Differential Revision: https://reviews.llvm.org/D130402