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Do some restructuring to improve performance of the catcaches. Teach
CatalogCacheFlushRelation (formerly called SystemCacheRelationFlushed) how to distinguish tuples it should flush from those it needn't; this means a relcache flush event now only removes the catcache entries it ought to, rather than zapping the caches completely as it used to. Testing with the regression tests indicates that this considerably improves the lifespan of catcache entries. Also, rearrange catcache data structures so that the limit on number of cached tuples applies globally across all the catcaches, rather than being per-catcache. It was a little silly to have the same size limit on both, say, pg_attribute caches and pg_am caches (there being only four possible rows in the latter...). Doing LRU removal across all the caches instead of locally in each one should reduce cache reload traffic in the more heavily used caches and improve the efficiency of cache memory use.
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