[llvm] [z/OS] Implement shared memory handling for JIT (PR #89933)

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``````````bash
git-clang-format --diff 74e07ab523122d6a8347b25770062ab331b6bb84 00033e062e3bebf6a1255ac7f76838a856e13ec8 -- llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp b/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
index ba538abcc3..bba3329e8c 100644
--- a/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
@@ -17,8 +17,8 @@
 #include <fcntl.h>
 #include <sys/mman.h>
 #if defined(__MVS__)
-#include <sys/shm.h>
 #include "llvm/Support/BLAKE3.h"
+#include <sys/shm.h>
 #endif
 #include <unistd.h>
 #elif defined(_WIN32)
diff --git a/llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp b/llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp
index eb9864ee83..f5118c0f2b 100644
--- a/llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp
@@ -19,8 +19,8 @@
 #include <fcntl.h>
 #include <sys/mman.h>
 #if defined(__MVS__)
-#include <sys/shm.h>
 #include "llvm/Support/BLAKE3.h"
+#include <sys/shm.h>
 #endif
 #include <unistd.h>
 #endif
@@ -152,7 +152,7 @@ Expected<ExecutorAddr> ExecutorSharedMemoryMapperService::initialize(
 #if defined(LLVM_ON_UNIX)
 
 #if defined(__MVS__)
-    // TODO Is it possible to change the protection level?
+      // TODO Is it possible to change the protection level?
 #else
     int NativeProt = 0;
     if ((Segment.RAG.Prot & MemProt::Read) == MemProt::Read)

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https://github.com/llvm/llvm-project/pull/89933