Commits on Jun 1, 2018

1. blockchain: Optimize block locator generation. …

   This significantly optimizes and simplifies the generation of block
   locators by making use of the fact that all block nodes are now in
   memory and therefore it is no longer necessary to consult the database
   for the hashes or worry about issues related to dynamic loading of nodes.
   
   Also, it slightly modifies the algorithm so that the doubling doesn't
   start for one additional iteration in order to mirror the upstream code.
   Due to the way block locators are used, this does not change any
   semantics in terms of requesting and locating blocks.
   
   Finally, the semantics of BlockLocatorFromHash have been changed to
   return a locator for the current tip in the case the hash is unknown.
   This is preferable since only including the passed block hash, when it
   isn't known, could end up leading to causing a redownload of the entire
   chain under certain circumstances.

   

   davecgh committed Jun 1, 2018
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