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MDEV-28313: Shrink ReadView::m_mutex
A few PERFORMANCE_SCHEMA instrumentation keys were not exposed in all_innodb_mutexes[]. Let us remove them. The keys fts_pll_tokenize_mutex_key and read_view_mutex_key were internally used. Let us make ReadView::m_mutex use the simpler and smaller srw_mutex, hoping to improve memory access patterns.
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