Log Message:
-----------
merge patch:  Add SPI_push/SPI_pop calls so that datatype input and output

Add SPI_push/SPI_pop calls so that datatype input and output functions called
by plpgsql can themselves use SPI --- possibly indirectly, as in the case
of domain_in() invoking plpgsql functions in a domain check constraint.
Per bug #2945 from Sergiy Vyshnevetskiy.

Modified Files:
--------------
    plpgpsm/src:
        pl_exec.c (r1.32 -> r1.33)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_exec.c.diff?r1=1.32&r2=1.33)

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