Add initial llvm-jitlink support for SystemZ.

Author: anoopkg6

llvm/include/llvm/ExecutionEngine/JITLink/ELF_systemz.h

@@ -0,0 +1,39 @@
+//===--- ELF_systemz.h - JIT link functions for ELF/systemz --*- 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-link functions for ELF/systemz.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_JITLINK_ELF_SYSTEMZ_H
+#define LLVM_EXECUTIONENGINE_JITLINK_ELF_SYSTEMZ_H
+
+#include "llvm/ExecutionEngine/JITLink/JITLink.h"
+
+namespace llvm {
+namespace jitlink {
+
+/// Create a LinkGraph from an ELF/systemz relocatable object
+///
+/// Note: The graph does not take ownership of the underlying buffer, nor copy
+/// its contents. The caller is responsible for ensuring that the object buffer
+/// outlives the graph.
+Expected<std::unique_ptr<LinkGraph>>
+createLinkGraphFromELFObject_systemz(MemoryBufferRef ObjectBuffer);
+
+/// jit-link the given object buffer, which must be a ELF systemz relocatable
+/// object file.
+void link_ELF_systemz(std::unique_ptr<LinkGraph> G,
+                      std::unique_ptr<JITLinkContext> Ctx);
+
+} // end namespace jitlink
+} // end namespace llvm
+
+#endif // LLVM_EXECUTIONENGINE_JITLINK_ELF_SYSTEMZ_H