[lldb] Propagate llvm::Error to report_fatal_error

Instead of having a custom error message, propagate the llvm::Error from
SystemInitializerCommon. I didn't realize we had this overload until
Pavel mentioned it in D90987 today.
diff --git a/lldb/source/API/SystemInitializerFull.cpp b/lldb/source/API/SystemInitializerFull.cpp
index cd5b464..a6421d8 100644
--- a/lldb/source/API/SystemInitializerFull.cpp
+++ b/lldb/source/API/SystemInitializerFull.cpp
@@ -42,7 +42,7 @@
     // this, we terminate here before the uninitialized debugger inevitably
     // crashes.
     if (repro::Reproducer::Instance().IsReplaying())
-      llvm::report_fatal_error("system initialization failed");
+      llvm::report_fatal_error(std::move(error));
     return error;
   }