Teach SLRU code to avoid replacing I/O-busy pages.

Patch by me; review by Tom Lane and others.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/3ae5133b1cf478d516666f2003bc68ba0edb84c7

Modified Files
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src/backend/access/transam/slru.c |   92 +++++++++++++++++++++++--------------
1 files changed, 57 insertions(+), 35 deletions(-)

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