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Detect object conflicts during deserialization.
If two pre-compiled modules both tried to replace an object or STable with their own updated view of it, the latest one would always just win. This creates the "disappearing symbol" issue. This patch detects that it's going on and complains, rather than leaving a weird failure later on (the actual fix will be to replace the exception thrown with a hook to allow the module loader to do some smarter merging). Breaks no NQP tests or Rakudo spectests; does correctly pick up the RT#112626 case.
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