Log Message:
-----------
Attempt to return proper overflow/underflow messages for platforms that
only return Nan and set errno for pow/exp overflow/underflow.

Modified Files:
--------------
    pgsql/src/backend/utils/adt:
        float.c (r1.136 -> r1.137)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/float.c.diff?r1=1.136&r2=1.137)

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