[upstreaming] Revert reordering of CalculateProcess call

Author: Teemperor

lldb/source/Expression/Materializer.cpp

@@ -959,9 +959,6 @@ class EntityResultVariable : public Materializer::Entity {
             : persistent_state->GetNextPersistentVariableName(
                   *target_sp, persistent_state->GetPersistentVariablePrefix());
 
-    lldb::ProcessSP process_sp =
-        map.GetBestExecutionContextScope()->CalculateProcess();
-
     lldb::ExpressionVariableSP ret = persistent_state->CreatePersistentVariable(
         exe_scope, name, m_type, map.GetByteOrder(), map.GetAddressByteSize());
 
@@ -972,6 +969,9 @@ class EntityResultVariable : public Materializer::Entity {
       return;
     }
 
+    lldb::ProcessSP process_sp =
+        map.GetBestExecutionContextScope()->CalculateProcess();
+
     if (m_delegate) {
       m_delegate->DidDematerialize(ret);
     }