Avoid backout in check for PK\FK constraint
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                 Key: CORE-5111
                 URL: http://tracker.firebirdsql.org/browse/CORE-5111
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
            Reporter: Vlad Khorsun


Bug CORE-5110 was fixed using first (simple) way from choices below:

1. ignore no_gc flag in VIO_get_current() and backout dead record version, or

2. make VIO_get_current() to reconstruct previous record version (which will
     be placed over currently dead primary record version).

Second way could be more efficient but more complex to implement

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