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(parent: cdd6123) | patch

Some refinement for the "fast path" lock patch.

Some refinement for the "fast path" lock patch.

1. In GetLockStatusData, avoid initializing instance before we've ensured
that the array is large enough. Otherwise, if repalloc moves the block
around, we're hosed.

2. Add the word "Relation" to the name of some identifiers, to avoid
assuming that the fast-path mechanism will only ever apply to relations
(though these particular parts certainly will). Some of the macros
could possibly use similar treatment, but the names are getting awfully
long already.

3. Add a missing word to comment in AtPrepare_Locks().

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