[COMMITTERS] pgsql: Keep heap open until new heap generated in RMV.

Keep heap open until new heap generated in RMV. Early close became apparent when invalidation messages were processed in a new location under CLOBBER_CACHE_ALWAYS builds, due to additional locking. Back-patch to 9.3 Branch -- master Details --- http://git.postgresql.org/pg/commitdiff/58

[COMMITTERS] pgsql: Keep heap open until new heap generated in RMV.

Keep heap open until new heap generated in RMV. Early close became apparent when invalidation messages were processed in a new location under CLOBBER_CACHE_ALWAYS builds, due to additional locking. Back-patch to 9.3 Branch -- REL9_3_STABLE Details --- http://git.postgresql.org/pg/commit