[FB-Tracker] Created: (DNET-748) Improve input buffer

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[FB-Tracker] Created: (DNET-748) Improve input buffer

JIRA tracker@firebirdsql.org
Improve input buffer

                 Key: DNET-748
                 URL: http://tracker.firebirdsql.org/browse/DNET-748
             Project: .NET Data provider
          Issue Type: Improvement
          Components: ADO.NET Provider
    Affects Versions:
            Reporter: Jiri Cincura
            Assignee: Jiri Cincura


I looked at DNET-740 (http://tracker.firebirdsql.org/browse/DNET-740) and found the single threaded performance to be worse than it was.
Main performance killer was _inputBuffer.RemoveRange(0, data.Length);

Replaced the list with a class that keeps a list of the readbuffers and removes them when no longer needed.

Example performance on same data with 444528 rows
5.8: 11s
after this pull: 3.9s

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