Limit max parameter number with MaxAllocSize

MaxAllocSize puts an upper bound on the largest possible parameter
number ($268435455).  Use that limit instead of INT_MAX to report that
no parameters exist beyond that point instead of reporting an error
about the maximum allocation size being exceeded.

Author: Erik Wienhold <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/9c2e660b07fc16bdd79c25047cce6cde2acb3f37

Modified Files
--------------
src/backend/parser/parse_param.c      | 3 ++-
src/test/regress/expected/prepare.out | 5 +++++
src/test/regress/sql/prepare.sql      | 3 +++
3 files changed, 10 insertions(+), 1 deletion(-)

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