Commits on Mar 25, 2021

1. [mbr] Fix encmap boundary and method RVA lookup. …

   Two separate issues:
   
   1. When we process the EnC map, any tables after the last one that has an
   update gets an "enc_recs" pointer that's one past the last row of the
   table.  (the enc_recs pointer is used to speed up relative address lookup).  So
   at lookup time if enc_recs says to look past the end of the EnC map table, we
   know there won't be any updates - return -1.
   
   2. When looking for the updated RVA of a method, we need to go through every
   delta and find the latest one that has an update for the given method.  The
   problem is that if a later generation doesn't have an update, we would take the
   NULL return value at face value and it would look like the method had no
   updates to its body - we would go back to using the original version from
   before any updates were applied.  Instead now ignore lookup table misses and
   remember the last successful lookup.  Fixes
   dotnet#50190

   

   lambdageek committed Mar 25, 2021
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