Simplify ParamListInfo data structure to support only numbered parameters,

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 2206b498d8240447a9353ce4e994ba41a8e307ac
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-04-22T01:26:01Z
Releases: 8.2.0
Simplify ParamListInfo data structure to support only numbered parameters,
not named ones, and replace linear searches of the list with array indexing.
The named-parameter support has been dead code for many years anyway,
and recent profiling suggests that the searching was costing a noticeable
amount of performance for complex queries.

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