pgsql: Fix contrib/bloom to not fail under CLOBBER_CACHE_ALWAYS.

Fix contrib/bloom to not fail under CLOBBER_CACHE_ALWAYS.

The code was supposing that rd_amcache wouldn't disappear from under it
during a scan; which is wrong. Copy the data out of the relcache rather
than trying to reference it there.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/8f75fd1f402acbc30bc15dbf51eb6dec1bbec600

Modified Files
--------------
contrib/bloom/bloom.h | 5 ++---
contrib/bloom/blscan.c | 4 ++--
contrib/bloom/blutils.c | 8 ++++----
3 files changed, 8 insertions(+), 9 deletions(-)

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