[ORC] Update mapper deinitialize functions to deinitialize in reverse order.

This updates the ExecutorSharedMemoryMapperService::deinitialize and
InProcessMemoryMapper::deinitialize methods to deinitialize in reverse order,
bringing them into alignment with the behavior of
InProcessMemoryManager::deallocate and SimpleExecutorMemoryManager::deallocate.
Reverse deinitialization is required because later allocations can depend on
earlier ones.

This fixes failures in the ORC runtime test suite.

Author: lhames

llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp

@@ -110,7 +110,7 @@ void InProcessMemoryMapper::deinitialize(
   {
     std::lock_guard<std::mutex> Lock(Mutex);
 
-    for (auto Base : Bases) {
+    for (auto Base : llvm::reverse(Bases)) {
 
       if (Error Err = shared::runDeallocActions(
               Allocations[Base].DeinitializationActions)) {

llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp

@@ -192,7 +192,7 @@ Error ExecutorSharedMemoryMapperService::deinitialize(
   {
     std::lock_guard<std::mutex> Lock(Mutex);
 
-    for (auto Base : Bases) {
+    for (auto Base : llvm::reverse(Bases)) {
       if (Error Err = shared::runDeallocActions(
               Allocations[Base].DeinitializationActions)) {
         AllErr = joinErrors(std::move(AllErr), std::move(Err));