Fix concurrent unordered containers build on GCC14 #1397
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Description
GCC14 still produces warnings for incorrect destructor or out-of-boundaries access while destructing the dummy_node since the correct destruction branch would be selected in run-time.
Adding
volatileto the value_node pointer still fixes the issue, so this PR prologues the workaround until GCC15 release.Fixes # - issue number(s) if exists
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Breaks backward compatibility
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