pgsql: Fix bugs in the COPY heap-insert batching patch.

Fix bugs in the COPY heap-insert batching patch.

Forgot to call RestoreBkpBlocks() in the redo-function, as pointed out by
Simon Riggs. In redo of a regular heap insert, it's taken care of in
heap_redo(), but this new record type uses the heap2 RM, and heap2_redo()
does not take care of that for you.

Also, failed to reset the vmbuffer and all_visibile_cleared local variables
after switching to a new buffer.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/f81648cb1ee5ce8d2e479a17db512046012c77e7

Modified Files
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src/backend/access/heap/heapam.c |   13 ++++++++++---
1 files changed, 10 insertions(+), 3 deletions(-)