Fix BOLT build errors when building with Bazel build file

[tmsriram]

Summary

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,

[tmsriram]

Delete forward declaration to BinaryBasicBlock.

[MaskRay]

(You may need to check both cmake and bazel builds when testing such changes)

[MaskRay]

Note (I was informed too), for future Bolt patches, we should use [BOLT] (uppercase) as the subject.

bolt/include/bolt/Core/BinaryDomTree.h

 //==- bolt/Core/BinaryDomTree.h - Dominator Tree at low-level IR -*- C++ -*-==//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the BinaryDomTree class, which represents a dominator tree
 // in the CFG of a binary function.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef BOLT_CORE_BINARY_DOMTREE_H
 #define BOLT_CORE_BINARY_DOMTREE_H
 
+#include "bolt/Core/BinaryBasicBlock.h"
+#include "llvm/IR/Dominators.h"
 #include "llvm/Support/GenericDomTreeConstruction.h"
 
 namespace llvm {
 namespace bolt {
 
-class BinaryBasicBlock;
 using BinaryDomTreeNode = DomTreeNodeBase<BinaryBasicBlock>;
 using BinaryDominatorTree = DomTreeBase<BinaryBasicBlock>;
 
 } // namespace bolt
 
 // BinaryDominatorTree GraphTraits specializations.
 template <>
 struct GraphTraits<bolt::BinaryDomTreeNode *>

bolt/include/bolt/Passes/RegReAssign.h

 //===- bolt/Passes/RegReAssign.h --------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef BOLT_PASSES_REGREASSIGN_H
 #define BOLT_PASSES_REGREASSIGN_H
 
+#include "bolt/Passes/BinaryFunctionCallGraph.h"
 #include "bolt/Passes/BinaryPasses.h"
 #include "bolt/Passes/RegAnalysis.h"
 
 namespace llvm {
 namespace bolt {
 
 class RegReAssign : public BinaryFunctionPass {
   std::vector<int64_t> RegScore;

utils/bazel/llvm-project-overlay/bolt/BUILD.bazel

deps = [
         "//llvm:DebugInfoDWARF",
         "//llvm:Demangle",
         "//llvm:ExecutionEngine",
         "//llvm:MC",
         "//llvm:MCDisassembler",
         "//llvm:MCParser",
         "//llvm:Object",
         "//llvm:Support",
+        "//llvm:ir_headers",
     ],
 )
 
 cc_library(
     name = "Utils",
     srcs = glob([
         "lib/Utils/*.cpp",
     ]),