Add pg_upgrade C comment about why we check all relkinds for regtypes.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/ecf7a2ea387a409f6152c05f60e5765c7436b8df

Modified Files
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contrib/pg_upgrade/check.c |    5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

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