Workaround an assertion failure during module build

After the change in https://reviews.llvm.org/D131858, clang cannot
bootstrap itself with modules due to assertion failure:
(lvaluePath->getType() == elemTy && "Unexpected type reference!")

Workaround the assertion by converting some of the includes into forward
declares.

Reviewed By: arphaman

Differential Revision: https://reviews.llvm.org/D139956

llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h

@@ -39,7 +39,6 @@
 #include "llvm/IR/Type.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/Transforms/Utils/ValueMapper.h"
 #include <algorithm>
 #include <cassert>
 #include <functional>

llvm/include/llvm/ExecutionEngine/Orc/IndirectionUtils.h

@@ -18,10 +18,11 @@
 #include "llvm/ExecutionEngine/JITSymbol.h"
 #include "llvm/ExecutionEngine/Orc/Core.h"
 #include "llvm/ExecutionEngine/Orc/OrcABISupport.h"
+#include "llvm/IR/ValueHandle.h"
+#include "llvm/IR/ValueMap.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/Memory.h"
 #include "llvm/Support/Process.h"
-#include "llvm/Transforms/Utils/ValueMapper.h"
 #include <algorithm>
 #include <cassert>
 #include <cstdint>
@@ -47,6 +48,9 @@ class Twine;
 class Value;
 class MCDisassembler;
 class MCInstrAnalysis;
+class ValueMaterializer;
+
+using ValueToValueMapTy = ValueMap<const Value *, WeakTrackingVH>;
 
 namespace jitlink {
 class LinkGraph;

llvm/include/llvm/ExecutionEngine/Orc/SpeculateAnalyses.h

@@ -13,14 +13,15 @@
 #ifndef LLVM_EXECUTIONENGINE_ORC_SPECULATEANALYSES_H
 #define LLVM_EXECUTIONENGINE_ORC_SPECULATEANALYSES_H
 
-#include "llvm/Analysis/BranchProbabilityInfo.h"
 #include "llvm/ExecutionEngine/Orc/Core.h"
 #include "llvm/ExecutionEngine/Orc/Speculation.h"
 
 #include <vector>
 
 namespace llvm {
 
+class BranchProbabilityInfo;
+
 namespace orc {
 
 // Provides common code.