[clang] [ORC] Implement basic reoptimization. (PR #67050)

[via cfe-commits]

================
@@ -0,0 +1,83 @@
+//===- IRPartitionLayer.h - Partition IR module on lookup -------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// JIT layer for breaking up modules into smaller submodules that only contains
+// looked up symbols.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_ORC_IRPARTITIONLAYER_H
+#define LLVM_EXECUTIONENGINE_ORC_IRPARTITIONLAYER_H
+
+#include "llvm/ExecutionEngine/Orc/IndirectionUtils.h"
+#include "llvm/ExecutionEngine/Orc/Layer.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/Constant.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GlobalAlias.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Type.h"
+
+namespace llvm {
+namespace orc {
+
+class IRPartitionLayer : public IRLayer {
----------------
lhames wrote:

It'd be good to add a class comment explaining the layer's behavior. (I know the file comment covers this, but people looking up the type docs may not see that).

https://github.com/llvm/llvm-project/pull/67050